1. Vehicle Suspension
  2. RAS
  3. Leaf Springs
  4. Rear Axle Suspension Enhancement
  5. Standard Duty
Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit

Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit

lowest price pledge
Retail:$484.16
Our Price: $469.00
You Save: $15.16
Vehicle Suspension

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

This item qualifies for Free Shipping
Shipping Weight: 29 lbs
Quantity: 
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos

Is this right for you? Product Expert Alex H says:

Yes, if you:

  • Prefer a system that helps your suspension whether you are towing, hauling, or riding empty
  • Don't want to deal with monitoring air pressure or checking for leaks - these are maintenance-free
  • Want a quicker and easier installation than air bags - these come preassembled and attach to your factory leaf springs

No, if you:

  • Are constantly towing or hauling - the heavy-duty model is a better option
  • Want to be able to manually adjust your suspension to provide the best ride whether your towing, hauling, or have an empty bed
2,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway. Lowest Prices for the best vehicle suspension from RAS. Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit part number RAS3611-Y can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (134)
  • Q & A (62)
  • Photos
  • Why etrailer?

RAS Vehicle Suspension

  • RAS
  • Leaf Springs
  • Rear Axle Suspension Enhancement
  • Standard Duty

2,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.


Features:

  • Custom kit converts your vehicle's factory leaf springs into a mechanically active suspension system
    • Actively strengthens leaf springs for improved ride quality with or without a load
  • All-in-one suspension system improves stability, handling, and control
    • Eliminates axle wrap, wheel hop, and bottoming out
    • Reduces dangerous sway and body roll while cornering
    • Keeps your ride level when towing or hauling a heavy load
    • Improves traction while breaking and accelerating
  • Variable-rated coil tension springs automatically adjust to your vehicle's load
    • Activate immediately to support the extra weight
    • Disengage when unloaded, allowing your leaf springs to perform as intended
  • Customizable coil springs can be adjusted during installation to accommodate your towing or hauling needs
    • Independently adjustable for side-to-side leveling of off-center loads
  • Helps extend the life of leaf springs, shock absorbers, shackles, and even tires
  • Durable, epoxy e-coated steel construction
    • Corrosion-resistant brackets on the ends of each unit have a salt spray rating of more than 800 hours
  • Easy, bolt-on installation - no drilling, cutting, or welding required
    • Unit secures under the leaf spring and around the factory U-bolts
    • Fully assembled kit and hardware are included
  • Maintenance-free - adjustments and monitoring aren't needed once installed
  • Made in the USA


Specs:

  • Weight capacity: 2,000 lbs
    • Roadmaster Active Suspension will not increase your vehicle's weight-carrying capacity
  • 2-Year warranty
  • 30-Day money-back guarantee


All-In-One Suspension System

When towing or hauling a heavy load, you may encounter a number of problems that can make your driving experience difficult or dangerous, such as sway, body roll, or bottoming out. When your vehicle is weighted down, your factory leaf springs can't counteract these problems to the extent that they are supposed to. The weight will overpower the leaf springs and cause them to twist or flatten out. When that happens, they cannot support, level, or stabilize your vehicle effectively. Additionally, because your factory leaf springs are passive, they won't begin to tackle problems such as sway until those problems have already started.


Diagram of RAS Installed

Roadmaster Active Suspension (RAS) kits enhance those passive leaf springs by converting them into a mechanically active, all-in-one suspension system. RAS kits have variable-rated coil tension springs that automatically adjust to your heavy load. Other suspension systems only solve a few problems and usually at the expense of other improvements your factory leaf springs may need. RAS, on the other hand, is a unique kit that provides everything you want in a suspension system without any trade-offs. It eliminates bottoming out like air springs, reduces sway and body roll like sway bars, keeps your ride level like helper springs, and improves traction and braking control like traction bars. This improves your vehicle's stability, handling, and control while you are towing or hauling, as well as when your vehicle is unloaded. RAS also makes your overall driving and towing experience safer and more comfortable, which greatly lessens driver fatigue.


How RAS Works

Close-Up of RAS Tension Spring

Each RAS unit has a powerful variable-rated coil tension spring that converts your passive leaf spring into a mechanically-active system. Once your vehicle is loaded, the tension springs immediately activate to absorb and support the weight. This allows your leaf springs to maintain their bowed position and keeps them from flattening out or flipping over, which greatly hinders their ability to bear a heavy load. The tension springs are variable-rated, which means that the heavier your load is, the more assistance they provide to your leaf springs. Because of this design, RAS reacts instantaneously, whereas hydraulics, air springs, and other suspension systems take time to react. And unlike your factory leaf springs, RAS stops sway and sag before they even start to happen. Additionally, when your vehicle is unloaded, the tension springs disengage, allowing your leaf springs to perform as intended without hardening your ride. RAS won't hinder your leaf springs' movement, nor will it cause any friction between any of the brackets.


Eliminates Axle Wrap and Wheel Hop

RAS Eliminates Axle Wrap

When under a heavy load, leaf springs are especially susceptible to axle wrap, which can cause wheel hop. Wheel hop is when the tires lose their grip on the road, causing a jarring, up-and-down movement. Axle wrap occurs when the circular motion of the tires cause the leaf springs to twist or rotate. If the leaf springs twist far enough, wheel hop can occur. RAS stabilizes your leaf springs by absorbing the force of the load they're trying to support. This eliminates axle wrap and wheel hop, as well as prevents your vehicle from bottoming out. Because of this, less strain is put on your vehicle. And by reducing some of this wear and tear, RAS helps extend the life of your leaf springs, shock absorbers, shackles, and even tires.


Reduces Sway and Body Roll

RAS eliminates sway and body roll

When driving along a curve while towing or hauling a heavy load, the back end of your vehicle or trailer can start to shift with that weight. If your factory leaf springs have flattened or twisted under this load, they won't be able to prevent it from shifting. Because of this, your trailer will sway away from your vehicle. This makes driving challenging and dangerous, as it increases the risk of body roll, which is when your vehicle drastically leans to one side. This can often cause you to completely lose control of your vehicle. Body roll is especially prevalent with multi-passenger vans and vehicles towing long campers, trailers, or boats. RAS provides a much safer ride by reinforcing your factory leaf springs and stabilizing your load. This helps prevent sway from occurring and reduces the chance of body roll while cornering, turning, and swerving. RAS also lessens the rocking motion that happens during windy conditions or when a semi passes by on the road.


Levels Your Ride and Improves Traction

RAS Levels Your Ride

When your vehicle is overloaded, the bulk of the weight transfers to the rear axle. Your factory leaf springs then become overwhelmed by this weight, as they are not strong enough to support it. This causes the back end of your vehicle to sag and the front end to rise, which means that the front tires have lost some of the grip they need with the road. In addition to loss of traction, it can also cause poor headlight aim, unintentional swerving, and an extremely bumpy and uncomfortable ride. RAS bolsters your factory leaf springs and enables them to provide support for your load without compromising ride quality or comfort. This keeps your ride level from front to back whether you are hauling a load in the bed or towing a boat, trailer, or camper. RAS also ensures that your tires have the traction they require while braking and accelerating, which improves the overall driving experience.


Customizable Coil Tension Springs

Adjusting Spring With Spacer

RAS is also customizable. During installation, the coil tension springs can be adjusted to 2 different tension settings or anywhere in between for improved road handling and support. To do this, rotate the springs while keeping the threaded rod still. As you turn the spring, use one of the 2 included spacers as a gauge to measure the widening gaps between the coils. In order for the RAS units to work as intended, you must tension the coils to a minimum of 25 percent with the 1mm white spacer and no more than 40 percent with the 2mm spacer. The springs can also be independently adjusted to compensate for off-center loads such as a handicap lift.


Easy, Bolt-On Installation

RAS Once Installed

This custom-fit kit comes fully assembled and is easy to install. Each RAS unit simply bolts onto your factory leaf spring with the included hardware, and drilling, welding, and cutting aren't required. First, position the eye hook bracket so that it wraps around the top of the factory leaf spring eye. Then the axle bracket secures under the leaf spring and around the factory U-bolts on the other side of the leaf spring pack. Once the maintenance-free RAS units are fully installed, you won't need to monitor them as you would with air springs.


Corrosion-Resistant Steel Construction

RAS Construction Close-Up

RAS is extremely durable and corrosion-resistant. The units are constructed of high-grade alloy steel, and they have an epoxy e-coat on the coil springs to provide extreme corrosion resistance. The brackets on the ends of each unit resist the effects of water and other elements, and they have a salt spray rating of more than 800 hours.



3611-Y RAS Custom Active Suspension System for OEM Leaf Springs - Rear Axle

Item # RAS3611-Y

Installation Details RAS3611-Y Installation instructions

This Product Fits The Following Vehicles





Customer Reviews

Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit - RAS3611-Y

Average Customer Rating:  4.7 out of 5 stars   (134 Customer Reviews)

2,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.

- RAS3611-Y
by:
Ford F-150

I did a lot of research to determine if I should use airbags or the RAS. For my application the RAS was the better choice. No matter who I asked, no one had a negative comment about this product (RAS). I tow a Jayco Travel Trailer (TT - 9000lbs) and while I have towed boats for years I was new to the type of tongue and hauling weight that the TT exerts on my vehicle. Installation was a breeze. I spent more time preparing my tools and finding my 22mm wrench than I did installing the RAS. There are many Youtube videos on how to install the RAS and I do recommend you watch them. My ride (F150 Echoboost) was smoother while pulling the trailer; however, I didn't feel any change to my daily driving (positive or negative). If you're using a WDH, I recommend these over the airbags. The airbags can be counter intuitive since the WDH should fix most of the weight distribution and level. The RAS works well with all WDH's and once installed you don't have to make any changes to it, unlike the airbags. Get the RAS - you'll be happy you did. 399233



- RAS3611-Y
by:

I have a 2016 F-150 4x4 with a 2 inch leveling kit and 305 tires. I am towing a 26RR Grey Wolf camper. I beleave it is 4992 lbs dry wait and 7775 lbs loaded. It is meant to be pulled with 1/2 ton trucks. Want to give all specs to be fair to the product. The product was easy to install. I adjusted spring to the black disk. When I hooked up the camper I notice my truck definitely squated less. The towing ride was less bumpy. That is it. It definitely did not improve fuel mileage. I am still at 8.5 miles to the gallon. That is on flat ground, I live in Florida. Still could not go over 65mph without camper feeling loose on the road. 3 stars for now until I tow other trailers. It was an improvement but not as much as I was expecting. Still going to go truck shopping for a bigger truck to solve my towing needs. Side note: truck looks great and rides way better without a trailer in tow. 2/22 inf 744719


Comments
The Roadmaster Active Suspension is designed to improve your trucks stability, handling, and control by keeping the truck level even when youre towing. When you say that your camper feels loose on the road, it sounds like your trailer starts to sway at speeds above 65 mph. The best solution for keeping your trailer tracking straight while rolling down the road is to use a weight distribution system with sway control. A weight distribution system will not necessarily improve your fuel mileage, but it will improve your experience towing your 30ft trailer. I have linked a help article on Weight Distribution systems for more information.
-- Victoria B - 01/27/2020

64875

- RAS3611-Y
by:
2017 Ford F-150

I own a 2017 F150 and placed the RAS3611-y kit last year. So far the ride improvement and the handling when pulling my equipment trailer with 7000# load is great. Air load adjusters would have been a mistake. Thanks George J. for a great product. No need for load levelers with this kit. 675401



- RAS3611-Y
by:
2014 Ford F-150

Thanks I put the springs on today’s. I have one question, I adjusted them to the 20% / one millimeter. Can they be adjusted to the 40% with truck sitting on ground if my trailer still has the bounce in it when hooked, or will I need to lift it off ground to readjust if needed. 590227


Comments
According to the manufacturer, when the suspension system is adjusted, the vehicle must be raised with the axle hanging free. This releases most of the spring tension.
-- Mike L - 12/12/2018

46660

- RAS3611-Y
by:
2014 Ford F-150

Just like your advertising said they were very easy to install. My ride has not been affected it still is a great ride for a truck. After the installation the rear end of my truck was 2” higher which will help when I hook up my camper, instead of sagging now my truck is level they are a great product . Thank you 540473



- RAS3611-Y
by:
2018 Ford F-150

Worked as described and made a big improvement towing our travel trailer. 526259



- RAS3611-Y
by:

2016 Ford F-150 XLT 4x2 - We would get a gallop when we would be towing our travel trailer and after reading several reviews for the Roadmaster Active Suspension System we decided to purchase the system. Just like most of the reviews it took more time to jack up the truck and remove the wheels then it was to install the system. It did raise the bed of the truck about an inch. Anyone who owns a late model F-150 will tell you that it rides just like a sedan. It was no different after the installation. I did take a short drive with the trailer attached and it was a smooth ride (no gallop). At this point I would consider this a success. The one thing that I would like to point out is if you have the same F-150 model that I have I would purchase RAS3611-B not RAS3611-Y. The “B” model has a block that covers the emergency brake bracket on the passenger side install. 754937



- RAS3611-Y
by:
Ford F-150

Worth every cent. Very good for additional stability, helps reduce drop when trailering. Pulled our 6800# travel trailer to Alaska with our Ford F150, and truck and trailer took a beating, 19000 miles. Easy install. 737836



- RAS3611-Y
by:
2015 Ford F-150

Product was very easy to install. Very well made. It took me about 35 minutes to install both sides once the truck was on Jack stands. Product did raise the rear of my truck a little. Can't say how much because I forgot to measure before I started. Truck still rides nice, no harshness or strange noises. I purchased the roadmaster active suspension to help eliminate squat and improve driveability while towing our 7500lb travel trailer. Hopefully I will get to try it out with the trailer soon. 595303


Comments
RAS is still working great . I have to make a correction. Our trailer is 8005lbs empty and it is a pull behind not a fifth wheel. Tongue weight is about 900lbs with my motorcycle in the garage and the garage is in the front. When used in conjunction with my weight distributing hitch, my truck rides great and handles great.
Aaron - 01/07/2020

64085

- RAS3611-Y
by:

I have had this product a couple of months now with two trips pulling my travel trailer. It has helped in leveling out the truck/trailer so that less pressure is applied to the weight distribution system. Product is easy to install, I didn’t even need to take the tires off. It also is easy to adjust to fit different hitch weight. It did make my truck ride a little ruff but not to a point that is uncomfortable. I chose this product over air type products as I didn’t want to have to mess with it. I would recommend this product. 593932



- RAS3611-Y
by:
2016 Ford F-150

As with many other reviewer's I researched several different brands and types of systems. The springs have helped out immensely with the tongue weight I have to pull with my F-150. I notice a 2 to 3 inch difference in the ride height with the springs on while towing approximately 1200 to 1400 pounds of tongue weight. It also takes out the bouncy feel from truck to trailer on non-smooth roads. The installation is very simple and quick. I highly recommend this product. 443416



- RAS3611-Y
by:

Delivery was on time and the product was good and ready to go! Jacked up the truck put it on stands and 1hr 30mins later I was driving off for a test run. Works just like it says it would. No body roll, takes off so much smoother, and I did about 40 over those big rolling neighborhood speed bumps and it was super smooth. Before RAS it would have a real bouncy feel over the speed bump now it attack the bump if you know what I mean. I tow a 25' trailer so I can't wait to see how much bounce is taken out when I'm driving over the dippy roads through the mountain pass here in WA. Thanks E-trailer! 313970


Comments
My initial review was was 5 star rating and after one year of use it still remains a 5 ??. I have a chance now to tow my 25’ travel trailer for a season and works great. It helps with proposing and reduced the little sag when I have her loaded up for a long trip. Highly recommend RAS with a WDH combination for smooth comfortable towing experience.
Doug D - 11/05/2017

30566

- RAS3611-Y
by:
2018 Honda Passport

For anyone on the fence, I will say it does work well. I'm not sure it is worth it, but that's the price. Also, as others have said, finding your tools is the hardest part of the Installation. 2018 F150 Platinum pulling a 2018 Passport 2920bh 546842



- RAS3611-Y
by:
2018 Nissan Leaf

Installed the Roadmaster auxiliary springs on a 2018 F150 Screw FX4 (max tow package; 7000 lbs rated payload capacity) because I've been unhappy with how much the rear squats when towing an enclosed car trailer (I use a weight distributing hitch), and a bit displeased with how the truck handles bumps, dips, etc. For whatever reason, Ford installed a weaker leaf spring pack on this truck / model (one fewer leaf spring than on earlier model I owned with a 7200 lbs payload capacity). In general, maybe because of the FX4 package, maybe because of the smaller wheels on this truck than my older F150 (18" vs. 20"), there is much more range of uncontrolled motion in this 2018, and much more bounce and jarring over uneven pavement. In my opinion, the rear leaf spring pack and shocks -- on this truck -- are not well matched. After considering air bags or an auxiliary leaf spring, I contacted Etrailer and chatted with a rep, who guided me to this Roadmaster unit. The rep was very helpful and took the time to discuss how I used my truck in order to determine the best option for me. Since I do not tow frequently (12-15 x per year), and my tongue wait varies between 600 - 700 lbs, the Roadmaster seemed to be a good middle-of-the road option over air bags, which require constant monitoring (not a big deal if you use your truck all the time). I wanted a "set it and forget it" option, and the Roadmaster was designed to be just that. The units installed very easily (I have access to a lift), the instructions are clear, and there's a very helpful video available on Etrailer's site. Most importantly, the ride smoothed out immediately as compared to stock. I set the units for the maximum payload increase rating (40%), which raised the rear end enough that the truck now looks a bit like a late '60s - 70s American muscle street rod (not a look I was trying to achieve), but the ride is far superior to stock. The truck no longer bounces, jars, or deflects to any significant degree, but the ride remains supple and smooth (I know, strange description for a truck). This is not to say that the stock ride quality was generally bad, but it certainly needed improvement for my tastes and needs. Unfortunately, I've not had the opportunity to tow with the auxiliary springs at the time of this review, but I am certainly optimistic that the ride height will now be level, and the ride quality improvements will be retained while towing. This is a good product, well made and supported, and Etrailer was a pleasure to work with. Very helpful sales representatives, fast shipping, and good customer support. 538434



- RAS3611-Y
by:
2013 Ford F-150

I’m impressed by the quality and engineering of this product. The person who designed it should win an award! I installed this on my 2013 F150 in preparation for hauling around my 1998 24’ coachman I’ve been working on fixing up all winter. I didn’t want a solution that would stiffen up the trucks ride because it’s very comfortable. I can’t feel any change in ride. Installation was very easy, took about an hour for everything and just a few tools. I haven’t towed with it yet but I did hook my trailer up and it didn’t squat like it did before. So far, very impressed. I’m glad I didn’t mess with airbags and all. 629033


Comments
I love this product. It has exceeded my expectations. I absolutely recommend this product as an effective, efficient and simple solution for towing.
Randy H - 04/16/2020

73397

- RAS3611-Y
by:
2018 Ford F-150

Excellent product as always from one of my favorite companies. The items (including this one are always as described. This provides leveling for my 2018 F150 while towing and makes a huge different. 654097



- RAS3611-Y
by:

Awesome product. I just bought my F-150 in July and quickly realized it needed something to assist with rear sag while towing or hauling any weight in the bed. After much research, this is the perfect product. It was simple to install so will be simple to remove if needed. My truck used to feel loose in the steering but now feels more planted while driving at all speeds. Super happy! 880632



- RAS3611-Y
by:

This system is amazing. Installed on a Ford F-150 2019. Very easy to install in my driveway with basic tools. Instant improvement in handling around the town, way more planted feel and cornering improvement. Main reason I installed was to improve towing a boat and travel trailer. Wow this thing really worked and truck rode higher in the suspension. Overall great product. Only limitation is really heavy load, took them off and installed airbags to level for heavy loads. Very bummed this would not work with the airbags installed. 870324



- RAS3611-Y
by:

Just received box 856887



- RAS3611-Y
by:

If I had known the heavy duty RAS for the F150 was coming out so soon I would have waited. We still have a bit of squat when the camper is hitched up even after reducing the amount of tongue weight. 854688



- RAS3611-Y
by:
2018 Nissan Leaf

So far, so good. The Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit I ordered was shipped the same day and arrived about a week later. It came assembled as advertised. It took me about an hour to install on my 2018 Ford F-150. There were no surprises and the instructions were pretty straight forward and simple. The only thing I wished for was a better explanation between the 25% and the 40% tension setting on the spring. The is a noticeable difference in the handling of the truck. Although the ride quality is hard to quantify, I can certainly feel a difference when cornering, as the truck takes a flatter line with hardly any noticeable roll. I purchased this kit to aid in tail sag and handling when towing my 28ft RV. I will tackle the first tow this coming weekend and can offer a new review then. So far, I am completely satisfied. 847965



- RAS3611-Y
by:

Eazy to install with basic tools. Definitely helped prevent pickup sag with 5th wheel attached, unsure if it helped sway. Previous pickup had airbags which also did the job but are more difficult to install. 822875



- RAS3611-Y
by:
2015 Ford F-150

I think this is a good product. I definitely noticed a difference while towing. I got less porpoising on my 2015 F-150 4x4 SCrew w/5.5’ bed while towing my 7,000lb travel trailer and the rear felt more planted. I did not notice really any difference while unloaded. Ultimately for me I do enough towing that I decided to go up to a Superduty to make my longer towing trips less fatiguing. 807181



- RAS3611-Y
by:
Ford F-150

I went to these because I went up to a trailer that was over 7000lbs behind an F150. They were easy to install and have made the ride more comfortable. Really helped with porpoising and has made the rig feel more stable. Ended up raising the rear bumper by 1 inch. 804431



- RAS3611-Y
by:

I have had this suspension product now for a year. I really like the confidence it gives me while I am towing my travel trailer. It really adds the extra stability and control needed to drive while towing. During everyday use you also can feel the "extras" that it provides, less body roll, confidence through corners, and no bottom out during hauling. I would definitely recommend this product! 793460


33
175
Show More Reviews

Ask the Experts about this RAS Vehicle Suspension

  • How do I Pick the Right Roadmaster Active Suspension Enhancement Kit for my 2018 Ford F-150
    We can get this figured out! The weight capacities stated in the description is the amount of weight that these springs will support. These will not add capacity to your payload or the amount you carry but instead take some of the force off of your factory suspension decreasing wear and tear on the system helping it to last longer. In my experience it also helps the handling characteristics of the vehicle by reducing the body roll of the truck. The Roadmaster Active Suspension Custom...
    view full answer...
  • Best Suspension Enhancement for 2017 Ford F-150 to Reduce Towing Suspension Sag
    The RAS systems are by far the best suspension enhancement kits out there for vehicles like your 2017 Ford F-150 to reduce suspension sag. Main reason is that unlike other system this does not make your ride quality when loaded or unloaded (many state that the ride quality improves greatly) and also does not require the maintenance that air bags do as well. For as much as you plan on towing I'd go with the HD model part # RAS3611-YHD which gives 3,000 lbs of suspension support over the...
    view full answer...
  • Comparing SumoSprings, SuperSprings, RAS, and Air Bags for 2019 Ford F-150
    The Roadmaster Active Suspension (RAS) Custom Leaf Spring Enhancement Kit part # RAS3611-Y is what I recommend for a 2019 Ford F-150. The RAS Kit unlike the SumoSprings Solo Custom Helper Springs part # SSR-117-47 will engage right away so you don't have to reach a threshold before the support kicks. Therefore, they will do a better job of reducing sag/squat. In comparison to the SuperSprings Custom Suspension Stabilizer and Sway Control Kit part # SSA28, The RAS Kit can be adjusted and...
    view full answer...
  • How to Eliminate Porpoising when Towing Trailer with 2018 Ford F-150
    I have a great solution to the porpoising and bounce you are experiencing when towing with your 2018 Ford F-150. I recommend taking a look at the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit # RAS3611-Y if you have a 4WD or # RAS3611-B if you have the 2WD model. This will essentially convert your truck's leaf springs into a mechanically active suspension system. It will drastically improve the stability and control of your ride as well as eliminate that porpoising...
    view full answer...
  • Roadmaster Active Suspension Kit Recommendation for 2018 Ford F-150
    I really like the RAS systems like the part # RAS3611-Y you referenced. You get the load support you are wanting which is adjustable without the harshness of the jounce style setups and without the higher maintenance of the air spring kits. This would easily provide you with the support you are wanting so that your truck sits level so I would recommend it highly. I attached a review video for more info on it as well.
    view full answer...
  • Suspension Helper Springs to Reduce Sway on a 2020 Ford F-150
    The best suspension enhancement kit for your 2020 Ford F-150 that is going to help reduce body roll and sway as well as give your truck the added support it needs is the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit. The reason this kit is superior to the rest is because it is what is known as an "active" system, which means that it is constantly reinforcing your F-150's original leaf spring suspension. Because of where it installs (see accompanying photo) the force...
    view full answer...
  • Recommended Roadmaster Active Suspension For 2019 Ford F-150 4WD
    The correct Roadmaster Active Suspension for the 2019 Ford F-150 4WD is part # RAS3611-Y. The Roadmaster Suspension will do a great job at supporting and stabilizing the leaf springs to eliminate the body roll that you mentioned. They are easy to install because they simply bolt on without drilling. I have attached a video for your reference. Please keep in mind the Roadmaster Active Suspension systems do not fit the Raptor models.
    view full answer...
  • Roadmaster Active Suspension Front Clamp Orientation for 2019 Ford F-150
    I attached a picture that I got from RAS that shows how the front clamp is supposed to look of the # RAS3611-Y when installed on a Ford truck like your 2019 Ford F-150.
    view full answer...
  • Can Roadmaster Active Suspension Kit be Used with Weight Distribution Hitch
    Yes, the Roadmaster Active Suspension kits like the # RAS3611-Y work perfectly fine with weight distribution systems. They both work to fight and prevent suspension sag when towing so they complement each other well.
    view full answer...
  • Spacer and Adjustment for Use with RAS Spring kit for 2015 Ford F-150
    720 lbs of tongue weight is a solid amount for a 2015 Ford F-150 so going with the 40 percent spacer on the # RAS3611-Y that you mentioned would be the way to go to get the support needed for leveling the truck when towing. Beyond that though you are going to have to use some trial and error to further set the tension needed. It won't take long or be overly difficult but the amount of further adjustment can only be determined by you once you are all set up and ready to tow. If you check...
    view full answer...
  • Recommended Suspension Enhancement for 2016 Ford F-150 4x4
    The Roadmaster Active Suspension Kit # RAS3611-Y is the correct fit for your 2016 Ford F-150 4x4. This is a mechanically active system designed to eliminate the bounce you are experiencing. It will allow adjustment for the best fit on your truck but doesn't require any additional adjustment so it doesn't need to be changed for when loaded or unloaded. The SumoSprings Solo Custom Helper Springs - Rear Axle # SSR-117-47 are also a great option to eliminate the bounce by helping to level...
    view full answer...
  • Which Roadmaster Active Suspension Kit Fits 2018 F-150 XLT 4X4 Super Crew Cab FX4
    For your 2018 Ford F-150 4x4 the Roadmaster Active Suspension kit part # RAS3611-Y that you referenced is a confirmed fit and the correct part number. I don't have a phone at my desk but if you have other questions feel free to email me back with them! I attached a review video for this kit for you to check out as well.
    view full answer...
  • Why Is Less Tension Needed On A Weight Distribution Hitch When Used With the RAS for a Ford F-150
    The Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit like part # RAS3611-Y for your 2018 Ford F-150 only works when enough weight is placed on the vehicle's rear suspension for the leaf springs to flex. If you are using a weight distribution system then the amount of flex that is applied to the vehicle's rear suspension will be minimized because this is transferring that weight to the front axle. Therefore, if you have the tension on the spring bars too high then it would...
    view full answer...
  • Recommended Roadmaster Active Suspension On 2014 Ford F-150 For Travel Trailer w/Weight Distribution
    On your 2014 Ford F-150 STX, I recommend the Roadmaster Active Suspension Kit # RAS3611-Y if you have a 4WD truck or the # RAS3611 if you have a 2WD truck. This system easily installs over your leaf springs to improve the stability and control of your factory suspension. The mechanically active system eliminates porpoising caused by wheel hop. This adds critial strength (2,000 lb capacity) to your leaf springs without compromising ride quality. It instantly absorbs and disperses...
    view full answer...
  • Best Suspension Enhancement Kit for 2019 Ford F-150 That Requires no Maintenance
    The best suspension enhancement system for your 2019 Ford F-150 is the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit because it works continually to reinforce your leaf spring suspension, will not impact your unloaded ride, and requires zero maintenance after you install it. The correct Roadmaster Active Suspension Kit for your 2019 Ford F-150 will depend on if you have a 2-Wheel Drive or 4-Wheel Drive: - 2-Wheel Drive: Roadmaster Active Suspension Custom Leaf Spring...
    view full answer...
  • Is There A Slight Lift On The Roadmaster Active Suspension Kit
    I reached out to my contact at Roadmaster Suspension and they verified that with your 2017 Ford F-150 unloaded the Roadmaster Active Suspension Kit # RAS3611-Y may give you anywhere between 1/4" to 1" of height. Depending on how the truck is loaded, the extra height may vary. Just a reminder, the Roadmaster Active Suspension Kit is not designed to give vehicles more height. However, you may get more of a height increase just because there is an added product on your vehicle.
    view full answer...
  • Does Roadmaster Active Suspension Kit for 2016 Ford F-150 Affect Unloaded Ride Height
    The Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit # RAS3611-Y that fits your 2016 Ford F-150 will lift your truck about 1/2" to 3/4" so it will not be a large difference or one that you are going to notice making any changes to your unloaded ride quality. The RAS will only help your '16 F-150 by reducing the sway and "sponginess" you mentioned when you are towing your trailer. The reason for this is the RAS is an active system which works to continually reinforce...
    view full answer...
  • Adding Suspension Helper Springs to Reduce Sway on a 2017 Ford F-150 Short Bed
    What kind of trailer are you towing? The best thing to use to prevent sway is a weight distribution system with built in sway control. If you are interested in that then let me know the gross trailer weight if it is a travel trailer (bumper pull). If it is a 5th wheel or gooseneck trailer then there is no sway control for those. For your truck though adding some suspension enhancement will help some. Roadmaster active suspension # RAS3611-Y is a good option because it does offer some...
    view full answer...
  • Will Roadmaster Active Suspension Enhancement Kit Void Warranty on 2019 Ford F-150
    The short answer is no, adding the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit # RAS3611-Y to your 2019 Ford F-150 will not void your warranty because you are protected by what is called the Federal Magnusson-Moss Warranty Act. This act says if something breaks on your vehicle and you take it in for warranty repair, the dealer must honor your warranty unless whatever you have added to your vehicle or its installation actually caused the problem in question. The...
    view full answer...
  • Which Roadmaster Active Suspension Kit Fits 2020 Ford F-150
    The correct Roadmaster Active Suspension kit for your 2020 Ford F-150 is the # RAS3611-Y. This adjustable kit will give you up to an additional 2,000 lbs of support which will reduce sag when towing greatly and also acts similar to an upgraded rear sway bar and improves handling of the truck quite a bit as well.
    view full answer...
  • Can Roadmaster Active Suspension Fit Truck with Lift Kit
    As long as the leaf springs of your truck are the same the Roadmaster Active Suspension # RAS3611-Y will still fit. If the spring changed it's hard to say for certain what RAS kit would fit it since it would not have ever been tested.
    view full answer...
  • Recommended Suspension Enhancement for 2018 Ford F-150 to Reduce Trailer Squat
    Since ride quality when you're not towing with your 2018 Ford F-150 is a concern I recommend the RAS kit # RAS3611-Y. It fits the 4-wheel drive F-150. RAS systems fit on the factory leaf springs to strengthen them. The use coil tension to activate when extra weight is on the suspension but aren't activated without the additional load so the unloaded ride isn't compromised. I've linked the install details and a video for you to take a look at. They bolt right onto your truck's springs...
    view full answer...
  • Which Roadmaster Active Suspension Kit for 2018 Ford F-150 STX
    I'd go with the standard duty Roadmaster Active Suspension kit part # RAS3611-Y for your 2018 Ford F-150 4x4. This can give you the suspension support you'll need without being overkill for the weight you'll be towing. This is rated for 2,000 lbs of additional support.
    view full answer...
  • How to Adjust RAS Kit Without Black or White Discs
    We don't carry either disc included with the RAS kit, part # RAS3611-Y, as replacement parts, however you can find both of them almost anywhere for only 35 cents. According to my contact at Roadmaster Active Suspension you can use a quarter to replace the black disc and a dime for the white. Not bad.
    view full answer...
  • Suspension Enhancement Recommendation for 2017 Ford F-150 with B and W Turnoverball Installed
    For your truck we do have a solution that allows suspension enhancement to fit with a gooseneck or fifth wheel rail kit installed like the B and W # BWGNRK1115 you have but the air bag kits won't fit for the reason you mentioned. The mounting brackets interfere with the hitch brackets. Instead you would want a RAS kit like the part # RAS3611-Y which is a fit for your 2017 Ford F-150 and since it attaches to the vehicle on the leaf springs and not the frame it fits just fine.
    view full answer...
  • Which Roadmaster Active Suspension Kit Fits 2016 Ford F-150 Super Crew Cab
    For your 2016 Ford F-150 the Roadmaster Active Suspension kit part # RAS3611-Y is the correct fit and will help you tow your trailer level. But since you already have a weight distribution system I would verify first that the system is rated for the amount of tongue weight your trailer has and that it's set up properly. WD systems have tongue weight ranges and ideally your trailer tongue weight (including weight of any cargo behind rear axle) falls right into the middle of that range.
    view full answer...
  • Suspension Enhancement Recommendation for 2010 Ford F-150 Towing Travel Trailer
    When reading the description of the issues you you are experiencing and not noticing the part number you mentioned the first product I wanted to recommend was a Roadmaster Active Suspension like the part # RAS3611-Y which is a fit for your 2010 Ford F-150. It is going to greatly help reduce the rear suspension sag and will also help brace the suspension in a way that it will feel much more stable from left to right. Similar to a sway bar. There are different settings you can use that can...
    view full answer...
  • Would Two Suspension Enhancement Kits Help 2018 Ford F-150 Towing a Trailer
    In general you don't really need two sets of suspension enhancement on a truck like yours. The RAS kit part # RAS3611-Y will help give you more suspension support but if you are finding that even with the air bag kit you need more support you probably are towing beyond the capacity of the truck. A bigger advantage would be achieved with a weight distribution system as it takes and distributes some of the trailer tongue weight up to the front axle of the tow vehicle which helps with...
    view full answer...
  • Adjusting Road Master Active Suspension on 2013 Ford F-150 Crew Cab Short Bed for Towing 5th Wheel
    The Roadmaster Active Suspension Kit # RAS3611-Y is a confirmed fit for your 2013 Ford F-150 Crew Cab 4x4. To properly tension your spring, the black disc (2 mm thick) and the white disc (1 mm thick) are used for a gauge between the spring coils. The white disc is used to improve your factory suspension handling and 25% additional load capacity. The black disc is used to improve handling and 40% additional load capacity. This is according to page 4 of the instruction sheet which is...
    view full answer...

Do you have a question about this Vehicle Suspension?




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality vehicle suspension for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate vehicle suspension information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Expert Research:
Mike L
Expert Research:
Michael H
Expert Research:
Jameson C
Installed by:
Jeff D
Written by:
Mary E
Updated by:
Alex H
Updated by:
Isabelle B

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.


Product Experts Available Now!
Call 800-298-8924