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

Item # RAS3611
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Our Price: $469.00
Vehicle Suspension

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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 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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RAS Vehicle Suspension - RAS3611

  • Leaf Springs
  • Rear Axle Suspension Enhancement
  • RAS
  • 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
  • 5-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 RAS Custom Active Suspension System for OEM Leaf Springs - Rear Axle

Installation Details RAS3611 Installation instructions

This Product Fits The Following Vehicles





Customer Reviews

Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit - RAS3611

Average Customer Rating:  4.7 out of 5 stars   (304 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
by:

Night and day difference on our 2011 F150. Before installing the vehicle was almost undrivable at highway speeds due to bouncing/jerking when pulling our trailer. The bounce/jerk has been virtually eliminated since installing the Active Suspension. Installation was a breeze, hardest part was getting the wheels off the truck due to corrosion between the wheel and the rotors. Total install time was roughly 1hr 15 minutes including the stubborn wheels. Initially I was hesitant to order due to the price, but very happy with the results, etrailer also did a great job at guiding me through the process, shipping and answering a few technical questions along the way. Highly recommend if you need a little more spring/payload.



- RAS3611
by:
Ford

RAS is an excellent product that greatly reduced the rearend sag and sway that my 38 ft travel trailer was prone to produce. My Ford E350 V10 powered passenger van now tow my trailer like a dream.



- RAS3611
by:

only drove twice so far. already feel great control of the rear end. much increase of positive traction, with very little drop. extremely easy installation! perfect step by step(with pics) instructions included. also easy to follow video, somewhere. I cant remember where I watched. not hooking up trailer till next weekend, after alignment. maybe I'll be back. overall the "active" concept in this product is exactly what an intermittent hauler wants. there is no feel of preload on leafs when not loaded. the product creates much better roll stability. 2013 silverado 2500hd



- RAS3611
by:
2017 Ford F-150 Raptor

Easy install and very happy with the product as I pulled a 3,000 horse trailer after install and had very little sag on the 40% setting. I would add that it raised my Raptor about two inches in the back because the weight of the truck no longer sags it at least on the 40% setting.



- RAS3611
by:
2019 Ford F-150 Raptor

Very simple, straightforward install on my 2019 Raptor. Lifted rear 2”, allowing travel trailer to sit level to truck. Hoping long term results are just as impressive. Thank you.



- RAS3611
by:

This product is awesome, even the ride without a load was better. Great, I suggest this to anyone.


Comments
Great, I have recommended this to all my friends and colleagues that have a truck. Even if they are not hauling just a better ride for their truck
James F - 07/23/2021


- RAS3611
by:
2013 Ram 2500

I originally bought the product to try and bring my 2013 Chevrolet 2500 back to stock height. It has a surveyor pack tool system and tools weighting just over 1000 lbs, since the day it was new. The product did the job. The part that was a great surprise was sway control with all that weight. 6 months later I retired, sold the tool box system, but left the product on the truck because we also pull our 28 ft. travel trailer (10,000 lb) with the truck. Don’t need the lift because of the weight distribution system with anti-sway, but the truck is much more stable on the interstate than it used to be. With no load I really don’t notice the ride is any worse when hitting a bump. I love it!



- RAS3611
by:

I purchased this kit because I was hauling 1000-1200#s of livestock in the bed of my TitanXd. The kit greatly reduced the swaying side to side from the animals shifting around. I also noticed less bouncing fromy single axle trailer. Overall rode quality was improved and I would purchase again.



- RAS3611
by:

Great system installed on 15 seater van and has shown its worth on several occasion at high speed in keeping great control in emergency turns. Highly recommended.



- RAS3611
by:
2014 Ford F-150

I have been using Roadmaster Active Suspension for a year now. The product works as advertised and has greatly improved the stability of my F-150 pulling a 7500 travel trailer.


Comments
I have my RAS system for two years now and it performs as well the day I installed it.
Chris - 10/21/2018



- RAS3611
by:

Package arrived within 2 days after I ordered late in the evening. Well packaged, I have checked both the instructions and a couple of U-tube videos which show how easy they are to install. I will update upon completing the install, and had a chance to hook up our trailer.



- RAS3611
by:
2014 Ford F-150

Repeat customer. Just installed my second set of Roadmaster Active Suspension springs. Have not towed with them yet; however the ride on my 2014 F150 6.5' bed pickup is noticably smoother. I expect the result when I do tow my travel trailer to be the same as with my previous truck - night and day difference (no more "white knuckle towing)!



- RAS3611
by:

Amazing product does exactly what it's made to do.



- RAS3611
by:
2013 Ford F-150

The Product was easy to put on. I had a lot of trouble getting my back tires off. The instructions were okay, I got confused a couple of times. The video on youtube is great. I used that several times.



- RAS3611
by:
Ford

Good installation instructions. Product raised my 1996 Ford E350 back to stock height which I wanted. Handles washboard roads better. I am satisfied.



- RAS3611
by:

Fast Shipping great product!



- RAS3611
by:

Right competitive price, and incredibly fast shipping. What more can you ask! Now all I have to do is the work to install the units, which appears to be really simple for an average weekend mechanic like me.



- RAS3611
by:

Extremely pleased with the fast shipping and communication. Product arrived as expected and installed it today. Really pleased with the transaction. Highly recommended.



- RAS3611
by:
2017 Ford F-150 Raptor

Great customer service! All throughout the order, I was notified up-to-date info on the status. And the product was just what I had ordered. This company reminds me of that MEGA online company with how they processed the total order. Keep up the good work!



- RAS3611
by:

Excellent product and ease of installment was amazing.



- RAS3611
by:



- RAS3611
by:
2018 Ford F-150 Raptor



- RAS4611
by:

Review from a similar RAS in Vehicle Suspension


The bed of the truck measured 37.5" with a tool box weighing 200 lbs. The truck felt weighed down with passengers weighing 600lbs. Total weight 800lbs with a tank full of gas. After the install the truck rides smoother and certainly " like new". The stopping distance and acceleration distance have shortened drastically. I'm planning on loading up the bed and the Roadmaster Active Suspension RAS4611. My wife even drive it and she could feel the difference. "It drives like a muscle car." Buy it. Install time at a reputable mechanic shop was a 30 min. Install. I received them today at 1 pm and got it installed at 3:00 pm and finished the install at 3:30pm. It's an investment worth the price over traditional air bag system. Mechanic installed this on 2011 Nissan Titan SV.


Comments
What can I say. After a year of constantly driving through Texas roads and highways. I have moved twice and loaded the bed of my truck plus U-Haul 6x12 trailer and thy truck has not felt the load of it. The Active Road Suspension Leaf Spring is constantly sort of speak sensing if theres load so it can actively push it upwards. I have even driven up to the crazy roads of Pennsylvania and my pick drives smoother than when I got it from the dealer. Im telling you these things work. As any cautious driver upkeeping his own vehicle, I have periodically checked the bolts and location of the resistance in between the spring and it has not deflected or moved from its original installation. I believe every pick up must have these. It beats constantly putting air on the air bags especially in inclement weather like up here in Pennsylvania with the snow. I couldnt be more satisfied with this purchase. Thank you etrailer for offering this superb product.
Sergio R - 08/13/2021

Comments
Just like when I bought it.
Sergio R - 08/16/2021


- RAS3611-Y
by:

Review from a similar RAS in Vehicle Suspension


I found this items cheaper on another site but etrailer match and then beat the price. Item installed super easy, more work jacking up the truck and taking the tires off. Can be installed with out removing tires just make it easier to get it in. The item did lift the back of my truck 1 inch. See Pics.


Comments
Makes the ride a little stiffer but its a truck. Great when pulling my 37 camper. Helps out a lot!!!!
William - 03/30/2021


- RAS3611-HD
by:

Review from a similar RAS in Vehicle Suspension


Silverado 2500HD Ready to install out of the box. Simply extend the RAS out to become the proper length (shortened for shipping), remove the bolt to allow the fork to drop over the leaf spring and reconnect, hand tighten the assembly via turning the spring and check the "centered alignment", then tighten with a wrench (my socket wouldn't quite fit) until gap disc slips freely between the expanded spring. Took me longer to prep truck on a jack and two axle stands/remove tires for improved accessibility than the actual RAS installations. Added 1 inch of lift "empty weight". Will see how much squat is removed under load of our travel trailer this weekend! I'm not very mechanically inclined, and found this very easy to self-install - a level 1 project. NOTE: etrailer customer service also took their time w/ me over the phone to ensure I had ordered the proper kit for my vehicle, and although my order was sent to the vendor for direct shipment, I got it to Alaska in less than 10 days.


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Ask the Experts about this RAS Vehicle Suspension

  • Is Roadmaster Active Suspension Kit Needed In Addition to Weight Distribution
    The answer to your question will depend on how you use your truck. Vehicle-based systems like the Roadmaster Active Suspension system or air bags will work just fine with a weight distribution system, but they work best to suspend weight being hauled in the bed of a truck or in a vehicle's cargo area, while a weight distribution system does a better job of transferring a trailer's tongue weight from the rear tow vehicle axle to the front. If in addition to towing you also frequently carry...
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  • Recommended Roadmaster Active Suspension Kit For 2018 Toyota Tundra With Level Kit
    I do have an option for you but the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit part # RAS3611 is not a fit for the 2018 Toyota Tundra however the Roadmaster active suspension systems are compatible with a leveling kit. I recommend to use the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit part # RAS4611TD which is going to support the leaf springs to level out the ride. This system helps to extend the life of your suspension on the truck especially...
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  • Recommended Suspension and Sway Control for Springdale Trailer and 2018 Ford F-150
    The Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty # RAS94FR is rated for up to 3,000 lbs and the # RAS3611-B rated for 2,000 lbs are both good options for suspension enhancement to reduce sag. If you want to reduce sway then you'd be better off using a weight distribution system with sway control integrated. I recommend the Strait-Line Weight Distribution System w/ Sway Control - Trunnion Bar - 12,000 lbs GTW, 1,200 lbs TW # RP66084 along with hitch ball...
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  • Comparing RAS Leaf Spring Enhancement RAS3611 And SumoSprings SS52GR For 2019 Ford F-150 Raptor
    For your 2019 Ford F-150 Raptor towing a 6000lb boat I recommend using the Roadmaster Active Suspension Leaf Spring Enhancement Kit # RAS3611 you purchased as it will be the best at preventing sag like you are experiencing, but will also eliminate axle wrap and minimize sway and body roll giving you a better driving experience loaded or unloaded. This kit has a 2000lb load leveling capacity, where the SumoSprings # SS52GR you purchased only have a 1500lb load leveling capacity, and do...
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  • Which Suspension Enhancement Kit is Best for 2019 Ford F-150 Raptor
    The best suspension enhancement solution out there for what you are looking for on your 2019 Ford F-150 Raptor is the Roadmaster Active Suspension kit # RAS3611 as it gives the support you are wanting to reduce the sag when carrying cargo weight or towing but actually improves the ride quality and handling of the vehicle whereas basically every other option out there is going to sacrifice ride quality.
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  • Which Roadmaster Active Suspension Kit Fits 2020 Ford F-150 Raptor
    We do have a Roadmaster Active Suspension system part # RAS3611 that is a confirmed fit for your 2020 Ford F-150 Raptor and is the best option for suspension enhancement. Unlike other options this gives the support you want while also improving ride quality and handling. Most options end up making the ride quality pretty harsh.
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  • Can I use the Roadmaster Active Suspension Kit With The Timbren Rubber Springs?
    Since the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit # RAS3611 uses a different mounting system then the Timbren Suspension Enhancement System # TNRTTNA you will be able to mount both of them on your 2018 Nissan Titan XD. You may need to temporarily loosen and possibly remove the Roadmaster system from the mount on the U-bolts to install the Timbren Springs below the U-bolts on the leaf springs. Remember these systems will not increase your maximum payload or...
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  • Correct Roadmaster Active Suspension Kit for 2018 Ford F-150
    There is a Roadmaster Active Suspension Kit that will work for your 2018 Ford F-150 but # RAS3611 is not a fit for your truck. The exact model number of Roadmaster Active Suspension Kit you want for your F-150 is going to be # RAS3611-B.
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  • Recommended Suspension Enhancement for Leaf Spring Shudder While Towing with a 2014 Ford F-150
    Since the issue is with your leaf springs flexing I recommend using a Roadmaster Active Suspension (RAS) Custom Leaf Spring Enhancement Kit for your 2014 Ford F-150 as opposed to a Firestone Ride-Rite kit. The reason being that the RAS gives support directly to the leaf spring while the Firestone alternative will only come into play once when your vehicle is under load. If you have a 2WD then you need the kit # RAS3611 but for a 4WD you need the kit # RAS3611-Y. Please note that neither...
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  • Suspension Enhancement to Reduce Sag While Towing with 2018 Chevy Silverado 2500HD
    I recommend the RAS leaf spring enhancement, part # RAS3611, for your 2018 Chevy Silverado 2500HD. They help take the sag out of your truck when you're towing but they don't cause your unloaded ride to be rough or uncomfortable. I recommend the RAS because they're easier to install than air bag kits, which you said you don't want to mess with, but are still adjustable to accommodate the weight you're adding when towing. You make the adjustments when you install them and then leave...
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  • Recommended Helper Spring Solution for 2020 Chevy Silverado 3500 With Slide In Camper
    Actually, as long as your 2020 Chevy Silverado 3500 isn't a dually, the Roadmaster Active Suspension # RAS3611 would counteract the rear sag thus leveling out your ride and would reduce sway and body roll, so it would be the perfect solution. If you have a dually with top overload springs, you'd want to use the # RAS3611-CHD instead. I've linked to a video showing a typical install for you.
    view full answer...
  • Will the Roadmaster Active Suspension Kit Part # RAS3611 Increase Payload Capacity
    No, the Roadmaster Active Suspension Kit part # RAS3611 will not increase either the payload or towing capacity of your 2015 Chevrolet Silverado 2500 as with all of our suspension enhancements. They will work to help take some of the stress off your existing components by stiffening the leaf springs. This will in turn help to improve handling, stability, and vehicle sag. The above kit has a weight capacity of 2,000 lbs which in the case of your 5th wheel trailer would be pin weight....
    view full answer...
  • 2019 Ford Raptor with Active Fox Shocks Suspension Enhancement to Reduce Sag When Towing
    For your 2019 Ford F-150 Raptor that has the factory upgraded (for the year 2019) Fox active shocks we have suspension enhancement kits that will help reduce sag when towing like the Roadmaster Active Suspension Kit part # RAS3611 that you referenced. I really like this kit as it gives you additional support like you are wanting to reduce sag, reduces quite a bit of sway, and also is adjustable unlike most of the other options so you can tailor exactly how much additional support you need/want....
    view full answer...
  • Roadmaster Active Suspension System Compatibility with 2017 Nissan Titan XD
    The Roadmaster Active Suspension Kit # RAS3611 is a confirmed fit for your 2017 Nissan Titan XD 4WD diesel truck by the manufacturer. We have not shot a video of that particular install yet, but I have attached a couple videos of similar installations to assist. The RAS is easy to install and requires no welding, cutting, or drilling. It converts your basic leaf springs into mechanically active suspension that absorbs and dissipates load force for better stability and control whether...
    view full answer...
  • 2020 Ford F-150 Raptor Suspension Enhancement for Towing Camper Trailer
    The best suspension enhancement we offer for your 2020 Ford F-150 Raptor is the Roadmaster Active System part # RAS3611 as it gives you adjustable support like you are wanting to reduce the sag but it also doesn't make the loaded or unloaded ride quality harsh like other options. And also isn't as high maintenance as the air bag kits.
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    Image 1 for
  • Compatibility of Roadmaster # RAS3611 On 1999 Ford F-350 Dually
    On your 1999 Ford F-350 dually it sounds like you are looking for the best option for a smoother ride and that you already have the Firestone Ride-Rite Air Helper Springs # F2550. If so, do you have the Firestone Ride-Rite LS Rear Shock Absorbers # F4354 designed to work with those air bags on your vehicle? If not, I recommend adding them. You also already have the SuperSprings Custom Suspension Stabilizer and Sway Control Kit # SSA13 which I can see in the photo you attached. Based...
    view full answer...
    Image 1 for Image 2 for
  • Roadmaster Active Suspension Kit for 2002 Ford F-250/350
    The correct Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit for your 2002 Ford F-250/350 is the part # RAS3611 for the Standard Duty or # RAS3611-HD for Heavy Duty, which offers an extra 1,000 pounds of capacity. I don't believe there is a part number stamped onto these units so what you can do is compare the used set you're looking at with the images we have of these on the product pages or even send me a picture directly and I can try to verify. If you want to be safe...
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  • Recommended Roadmaster Active Suspension for 2017 Chevy 2500HD Diesel Towing 13,000 Pound Trailer
    The 2,000 pound standard RAS for your 2017 Silverado 2500, part # RAS3611, is going to be enough to help you tow your 13,000 pound Keystone. If you're only towing the trailer a few times a year this is the route I would go. If you're towing a lot more often then that the HD system, part # RAS3611-HD, is the way to go.
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  • Best Suspension Enhancement for 2019 Nissan Titan XD Towing Trailer
    The best suspension enhancement for your 2019 Nissan Titan XD is the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit # RAS3611 because it is an active system which works to continually reinforce your Nissan's original leaf spring suspension. The way it works is really simple but extremely effective: the force normally put on your truck's current springs - especially when towing but also when carrying cargo or when making a tight turn - gets transferred to the RAS Enhancement...
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  • Will Suspension Enhancement Increase Cargo Carrying Capacity of Truck
    Suspension enhancement products, such as those from Timbren and Super Springs that you mentioned, are designed to essentially enhance the vehicle's suspension. This enhancement will provide a smoother ride under load, reduce rear end sag, and increase the factory suspension's lifespan. These products will not, however, increase the actual capacity of the vehicle they are installed on. This is simply because a truck's capacity is set by numerous factors, including the rear axle, tires and...
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  • Suspension Enhancement Kit Recommendation for 2016 GMC Sierra 3500 Towing Fifth Wheel Trailer
    The Roadmaster Active Suspension Kit part # RAS3611 would be a great suspension enhancement setup for your 2016 GMC Sierra 3500. You would not need air bags on top of these. Since these will give you the additional support you need the air bags would be redundant.
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  • Recommended Method To Remove Rear End Sag When Towing 9000 lb Camper
    The most effective way to eliminate the rear end sag and return some of that load to the front truck axle would be to use a weight distribution system with an integrated sway control component. A weight distribution system uses leverage provided by spring bars to transfer a portion of the trailer's tongue weight from the rear truck axle to the front axle. This levels the ride height which will give you improved steering and braking performance. It will also angle your headlight beams back...
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  • Can Roadmaster Active Suspension Kit Affect Ride Height of 2016 Nissan Titan XD
    The Roadmaster Active Suspension kits like the part # RAS3611 can increase the ride height of the truck they are installed on. Since these are adjustable it really depends on how tight you adjust them to know what the change in height would be.
    view full answer...
  • Front Power Stabilizer Jacks Not Extending Or Retracting But Motor Is Working
    There are a few things that could be causing the issue with the front stabilizing jacks on your Keystone Springdale. Since you mentioned that starting to lower the jack manually allowed the electric motor to work it sounds like the battery for your trailer may be weak not allowing the jack to work properly. This is not an uncommon issue as raising a trailer requires quite a bit of power and it is definitely possible that the battery only has enough power to turn the motor but not...
    view full answer...
  • Roadmaster Active Suspension for a 2012 Ford F-150 FX4 SuperCrew Short Bed 4x4
    For your 2012 Ford F-150 FX4 SuperCrew 4x4 you will need Roadmaster Active Suspension system # RAS3611-Y. This model is for 4x4s but excludes regular cab models as well as the Raptor. The other one, # RAS3611, is for 2-wheel drive models and only fits regular cab models but excludes the Raptor.
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  • Suspension Enhancement Recommendation to Help Ride Quality of Winnebago Minnie WC321RK
    For what you described the Roadmaster Active Suspension system part # RAS3611 is your best option. The additional support will help with bottoming resistance and we've found also greatly helps with overall stability and ride comfort. Many report that after installing these it feels like a thicker rear sway bar since the vehicle just handles so much better. The HD version was not designed for your vehicle so I would not recommend it.
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  • Which Roadmaster Active Suspension Kit For a 2013 Ford F-150
    I can help you figure out which Roadmaster Active Suspension Kit will work best for your 2013 Ford F-150. Since you mentioned that you tow about 3500 miles a year I recommend the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit # RAS3611-Y which offers a 2000lb maximum capacity and will make for a more pleasant ride when you are not towing your travel trailer compared to the heavy duty option. If your truck is not 4WD you will need the Roadmaster Active Suspension Custom...
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    We actually don't have air bag suspension enhancement that fits your 2018 Ford F-150 Raptor (couldn't find any other places that do either), but we do have adjustable suspension enhancement that will work really well for what you are wanting. For that you'd want the part # RAS3611 which gives you up to 2,000 of additional support, isn't harsh like some options are, improves handling, and is adjustable by changing the spring tension. This would definitely be your best option!
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Info for this part was:

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