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  1. Vehicle Suspension
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  4. Rear Axle Suspension Enhancement
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RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty

RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty

Item # RAS3611-SHD
Our Price: $569.00
Vehicle Suspension

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3,000-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. Great Prices for the best vehicle suspension from RAS. RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty part number RAS3611-SHD can be ordered online at or call 1-800-496-5010 for expert service.
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RAS Vehicle Suspension - RAS3611-SHD

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

3,000-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.


  • Heavy-duty 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


  • Weight capacity: 3,000 lbs
    • RoadActive 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

RoadActive 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-SHD RAS Custom HD Active Suspension System for OEM Leaf Springs - Rear Axle


Installation Details RAS3611-SHD Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty - RAS3611-SHD

Average Customer Rating:  4.7 out of 5 stars   (535 Customer Reviews)

3,000-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.


Very easy to install and what a difference it made. No drop when hooking up my 11,000 pound camper anymore meaning better driving


I tried to like it but just couldn’t. It didn’t help the suspension at all. I had it professionally installed and adjusted 3 times to no avail. It honestly didn’t change anything in the trucks stock suspension. I took it off and got air bags and am much happier. That was a lot of money to spend to not help my trucks suspension. I tried selling them but can’t. Word must be out how bad these are.

This system is intended for use on vehicles in which the suspension is in good shape. It is designed to strengthen the leaf springs however is not design to correct rear sag. It does have a 30 day money back guarantee. I would recommend air bag system part # AL57396
Air Lift LoadLifter 5000 Air Helper Springs - Rear Axle
and compressor system part # AL25856
Air Lift Load Controller Compressor System for Air Helper Springs- Heavy Duty - Dual Path
which will give greater adjustment to the loads that are carried.
-- Etrailer Expert Jenny N - 10/18/2021

Nissan Leaf

Purchased the Roadmaster Active Suspension Leaf Spring to level my 5th wheel and truck bed while under load. Based on our typical annual mileage pulling the trailer I did not want to spend the additional money to install air bags. After several trips pulling the 5er we experienced a much smoother ride and better handling expecially in the mountains. I am very pleased with my purchase.


5 stars is based solely on the extremely fast shipping. I looked at purchasing these from the manufacturer, however after seeing they had a 3 week wait time I I logged onto Etrailer and learned they were in stock for immediate shipping. Every thing that I have orders from Etrailer has shipped fast. I will continue to use Etrailer as my go to source for camper needs.

I originally put shaded this for towing a travel trailer and it worked great. I have since upgraded to a 5th wheel and the system is still impressive. Highly recommend the purchase
James - 08/05/2021


Installed about a year ago. Wish I had installed them on every truck I had ever owed! Improved overall ride both empty and loaded. No more squat. 2016 Ford SuperDuty


The installation was going to be difficult so I didn’t install. They are still sitting in my garage.



Review from a similar RAS in Vehicle Suspension

I love the product since i have a 2021 toyota tacoma crew cab long bed with a campertop a robber mat and a jack thats around 450 pounds that a have at all times my truck was sittind low a lilbit plus it was swagging on the road i have summo spring to help my suspention but it was not enoght so i did my research but this was my better option i just installed it yerterday july-8-2021 and went for a ride where i ussually drive everyday and WOW now my truck rides very smood plus it lift my tryck 1 inch on the back now my tryck seats level it took me about 2 hrs but i did right i just follow the intructions and done i love the product the only thing that im concern is that the left side underneat the springleaft there is a breik line that is too close to the roadmaster suspention i hope that with the time dont hit that line because if it does thats the line for the breiks and i will be in trouble replacing it other wise evreything works great i recomend it 100% thanks guys i will buy it again?????best $500 that i spend on my truck

Its been working very well i loaded a couple of times and its awesome
Miguel - 07/10/2022


Review from a similar RAS in Vehicle Suspension

I have a 2020 Silverado 1500 6 cyl Duramax with the Diesel Off Road package (3.73 diff). Travel trailer loaded is probably about 6,000 lb. I took several measurements during and after the spring kit installation. All measurements increased about an inch including the stock suspension with trailer and equalizer bars and with the spring kit installed at 1 mm spacing. A one inch improvement overall. I took the truck on a short drive and didn't notice any difference in ride (wasn't stiffer) which is what I wanted. Good to know that I can adjust the springs to the 2 mm spacing if I want to increase the suspension assist. Going camping next week and looking forward to see how it improves handling and porpoising.

After a year I am still pleased with this product. I had been adjusting the spring tension higher when towing and then back down after a trailering trip, but now just leave it adjusted to the trailer towing tension as the unloaded ride doesnt seem to suffer when the springs are tighter.
Rick M - 03/27/2022


Review from a similar RAS in Vehicle Suspension

Total transformation! I never knew how bad my ride was until I installed these RoadMaster 3611-HD active suspension. It took longer to safely jack my truck up and remove tires than it was to install them! Absolutely a game changer. I carry about 1000 lbs of tools and supplies daily and like riding a Rollercoaster when hitting bumps. Now, i hit bumps on purpose just to feel these RoadMasters work their magic! Love them!

After a year of use , these RoadMaster 3611-HD active suspensions are still the best addition to my trucks performance. The streets of Houston are brutal and these active suspension breeze through them. I have 354000 on this truck and if I ever get another, this Active Suspension will be the first addition. Hands down!
Tracey T - 04/29/2022


Review from a similar RAS in Vehicle Suspension

Overall, very happy with the product. GMC didn't have any way to improve the truck from squatting when I hooked up my trailer. This kit didn't stop the squatting but significantly reduced the bounce on bad dips in roads, bridge/road transitions and bad railroad crossings.


Review from a similar RAS in Vehicle Suspension

Roadmaster active suspension seems to be built very well. I look forward to towing my travel trailer very soon to see if it improves the towing experience.

It has been a year now since I installed the Roadmaster Active Suspension system on my 2018 F150. We pull a 30 ft travel trailer from Wisconsin to Alabama.Last year the roads became very slippery when we encountered a rain snow mix. The truck and trailer tracked perfectly. I just hooked up the rig yesterday to take the same trip, leaving tomorrow. The truck definitely handles better with the RAS. Im glad I installed it and am sure it will last for years.
Dave H - 01/30/2022


Review from a similar RAS in Vehicle Suspension

Installed for nearly 6 months now. I love this suspension! I needed something to give my '18 Titan some heft in the back end when pulling our 24' RV trailer but didn't want to deal with any of the air options out there. After reading the directions twice, I installed both sides before the AC/DC album was finished playing, so it's super fast and easy. I set them on 25% tension and really like how they drastically reduce porpoising during our RV drives. Well worth the cost.


Review from a similar RAS in Vehicle Suspension

Wait what?!
Should’ve put these on first
thing when I got the truck. Raised the rear a little over an inch, unloaded ride improves, and now tows level! No messing with air hoses, or pumping them up, just install and Tighten! Reminds me of accumulators on hydraulic setups, brilliant idea
2018 F150, 6.5’ bed, 3.5L EcoBoost


Review from a similar RAS in Vehicle Suspension

Admitedly, I haven't even rolled my '07 Silverado 2500HD classic out of the garage yet, but I'm already very pleased. I had to go to a neighbor for a 10mm hex key socket and was slowed down by my 7yo kid 'helping', but it was still only 90 minutes my jack stands were in use. Easiest thing to do!
My only small downsides so far:
* needed to find a 10mm hex key that I apparently don't own, not sure why they picked that fastener
* wish I put some loc-tite on; just to make me feel better
* distance to drop the axle so the suspension fully hangs was way further than I expected; barely had my jack stands tall enough to get the job done.

These aren't really bad on the product, just notes for future customers. We're towing the 5er about an hour an a half this coming week, hopefully it steadies up a lot!


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.

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


Review from a similar RAS in Vehicle Suspension

I received this kit in a very timely manner always do from etrailer have some issues with the instructions that come from roadmaster not a trailer the bump stop spacer didn’t say that you need to use the original bolt from the bump stop so it slowed me down greatly on the install however I took it out on a quick run without a load I do feel that this has made the unloaded ride smoother tomorrow I’ll be taking the trailer out for a bit and we’ll see how it works there and I’ll update this rating.


Review from a similar RAS in Vehicle Suspension

Haven’t got to tow with them on yet. But overall they look and feel like they are great quality and were extremely easy to install. I had one slight hiccup and had to call customer support. I was on the phone and connected to an actually person within a minute, great customer service.
Without a load, my 98 Blazer rides very smooth, only slightly stiffer than stock. Also raised the rear maybe an inch, but not a big deal.


Review from a similar RAS in Vehicle Suspension

1 year with RAS and I believe it's a great product. It helps distribute weight and increases towing confidence. Using RAS with heavy tongue weight significantly reduced bouncing effect compared to OEM.


Review from a similar RAS in Vehicle Suspension

Good service. Fast shipping an very easy installation. Can tell alittle difference already. Haven't hooked up to anything yet but always have a good bit in the bed 85 gallons of diesel an 2 full toolboxes


Review from a similar RAS in Vehicle Suspension

Not to happy with the RoadActive suspension leaf spring kit. I loaded them on a 2017 f-150 with a 6” lift to pull a 6000lbs bumper pull trailer. Still squats pretty good even with the RAS torque to the highest/Safest tension and also quite a bit of bounce in it. I do have a weight safe brand adjustable ball hitch to try to counter the Small height from the lift. I do like the look of it on but don’t feel to safe towing the trailer

I reached out to the manufacturer about your experience and they did have a few suggestions. They advised that the HD version that is rated for 3000 pounds part # RAS3611-YHD
RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty
, might have been a better option. It would be a fit for the 2017 Ford 150. They also advised that if you have set the tension at the suggested 2mm black disc there is still room for an additional tension setting. The absolute max tension that can be set on the spring, is 3mm gap between the coils of the spring. This would be the white and black disc together, keep in mind adjustment must be made with truck in the air - axle hanging free.
-- Etrailer Expert Jenny N - 10/27/2022


Review from a similar RAS in Vehicle Suspension

I installed these springs on my 2007 Silverado 2500HD that is used for towing a bumper pull horse trailer. With two or three horses in the trailer plus camping gear in the bed, the truck tended to squat more than I liked. These springs totally fixed that issue. I was concerned that they would cause a harsh ride when unloaded and not towing, but I honestly haven't noticed a difference.

To install the springs, the rear of the truck needs to be raised by the frame high enough for the axle to hang freely from the leaf springs. This would be easily done on a lift. It was a little tricky lifting it high enough in my driveway, but it was doable with a large jack and some tall jack stands placed under the forward leaf spring mounts.

To set the tension, I tightened them to the thinner 1mm shim, plus an extra turn or two. It seems to be fine for my purposes so I intend to leave them there.


Review from a similar RAS in Vehicle Suspension

Would have liked to of gotten it sooner nevertheless I understand that these things happen but your guys is service is always outstanding And you’re always there for all the questions that I have and everything I purchased from you through the years thank you

Great 10 out of 10
Ron - 10/15/2022


Review from a similar RAS in Vehicle Suspension

This is my 2nd set of RAS! Just purchased for towing in my D-Max 2500HD. 1st set we’re on a Chevy 1500. I tow a 7000lb 259FKDS Freedom Express bumper pull and having the RAS-HD’s installed is night and day difference in towing. I have them set at 40% because of my cargo in the truck bed and tongue weight. I’m set up right now as I type on a 100 mile camping trip to set the springs and readjust if needed! So I say….”if you need support with towing, give RAS3611-HD a try…you won’t be disappointed with the results”


Review from a similar RAS in Vehicle Suspension

Excellent addition to the truck. It did exactly what I wanted it to do, stiffen the springs so that I don't have so much squat with a trailer, as well as help to keep contact with the road by eliminating wheel bounce. I really appreciate the ride when I'm not pulling a trailer. I was worried it'd be too stiff, but no worries. One other thing, it lifted the rear of the truck up slightly so that it rides more level. I love it!

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See what our Experts say about this RAS Vehicle Suspension

  • RoadActive Suspension Kit Recommendation for 2013 Ford F-150 Rear Wheel Drive
    For your 2013 Ford F-150 that is rear wheel drive the RAS system that is recommended is the part # RAS3611 which will work great for your towing setup. Of the suspension enhancement kits that fit your truck this is widely considered to be the best option as it gives you the suspension support you are wanting but also gives you improved handling and ride quality.
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  • Will RoadActive Suspension Enhancement Void Warranty of 2013 Ford F-250
    When you install an aftermarket part on your vehicle like suspension enhancement in this case, you are protected by the Magnuson–Moss Warranty Act. This act states, in part, that unless the installation and the part caused a problem then the warranty cannot be voided. The RoadActive suspension enhancement kit part # RAS3611-SHD is a great option for suspension enhancement for you 2013 Ford F-250 and would not void any warranties when properly installed.
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  • Does RAS Enhancement Kit Raise 2019 Ford F-350 Super Duty
    The RoadActive Suspension enhancement, part # RAS3611-SHD for your 2019 Ford F-350, won't raise the unloaded right height of your truck. The RAS stiffens and helps support your existing suspension helping it to carry heavy loads and last longer. You likely will experience a gain in height in the rear when loading if you were previously experiencing sag with your truck.
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  • Will RoadActive Suspension Kit Fit with Air Lift Air Bags on a 2012 Ford F-250
    I contacted RAS about whether the # RAS3611-SHD suspension kit will fit with the Air Lift air bags on your 2012 Ford F-250. They confirmed that the two parts may be able to be used together. You'll need to make sure, on your truck, that there is at least 3-1/4 inches between the u-bolts for spring stack and the air bag kit you have. If there is then you have room to install the RAS kit.
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  • Which RoadActive Suspension kit for 2017 Ford F-250 Towing Fifth Wheel
    Since you do not have factory overload springs on your 2017 Ford F-250 the best RoadActive Suspension kit is the part # RAS3611-SHD which has the higher 3,000 lb capacity and also fits the non-overload spring models like you have. This will give you the adjustable support you are wanting and will also act similar to an anti sway bar as well in how it will improve handling.
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  • Should Air Bag Suspension Kit be Used with RoadActive Suspension On Toyota Tundra
    With the RoadActive Suspension kit part # RAS3611-SHD installed on your 2016 Toyota Tundra you would be fine to reduce the air bag pressure down to the minimum pressure of 5 psi. The RAS system should give you plenty of support and not require you to also have the bags providing support. If you find yourself in a situation where you need the bags inflated as well you are probably overloading the vehicle.
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  • Suspension Enhancement Recommendation for 2017 Ford F-250
    The best suspension enhancement kit we have for your 2017 Ford F-250 is the RoadActive Suspension Kit part # RAS3611-SHD actually. This gives you the best of all worlds in terms of suspension enhancement. It gives you the support you are wanting that's adjustable like air bag kits without the messy air pressure maintenance, but also gives you a smoother ride quality loaded and unloaded unlike the simpler setups like Timbren and SumoSprings.
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  • Suspension Enhancement Recommendation for 2020 Ford F-350 Towing 5th Wheel
    The best suspension enhancement we offer for your 2020 Ford F-350 that matches what you are looking for (stability and support) is definitely the RoadActive System part # RAS3611-SHD. Unlike other options that provide additional support this improves the ride quality and handling significantly so it's the best of all worlds.
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  • RAS vs Air Bags Recommendation for 2020 Ford F-350 SRW
    The RAS and air bag kits provide the same basic function of additional support to tow a trailer level like what you are doing and they both are adjustable but in general the ride quality of the RAS systems is much nicer than air bags so they are what I recommend the highest. So for your 2020 Ford F-350 the RAS # RAS3611-SHD is definitely your best option.
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  • Suspension Enhancement Recommendation for 2018 Ford F-250 Towing 5th Wheel Trailer
    The best rear suspension enhancement for your 2018 Ford F-250 that's towing a trailer will be the RoadActive Suspension kit part # RAS3611-SHD. Unlike other options this will actually increase stability and handling when towing and not towing and improve ride quality whereas other options will give you support but sacrifice ride quality while not improving handling and stability. These also don't require maintaining air pressure either like the air bag kits.
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  • What is Best Suspension Enhancement for 2022 Ford F-250 Super Duty
    For your 2022 Ford F-250 the best suspension enhancement is the RoadActive Suspension kit part # RAS3611-SHD which is easy to install, is adjustable in support, improves handling and stability, and unlike other options actually improves ride quality instead of making it worse.
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  • What Leaf Spring Enhancement do You Recommend for My 2022 Ford F-250?
    For a great suspension enhancement solution for your 2022 Ford F-250 Super Duty when towing a 10k fifth-wheel trailer, I recommend the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-SHD. Not only does this suspension kit offer sag elimination and improves overall traction, the kit also extends the overall life of your factory springs. This is especially important since you are planning to haul your trailer often. Another great thing about the kit is that it does not...
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  • Recommended Easy to Use Suspension Enhancement for 2019 Ford F-350 Super Duty
    We have the perfect suspension enhancement kit for your 2019 Ford F-350 Super Duty pickup, the RoadActive Suspension Custom Leaf Spring Enhancement Kit. This is the best because as the name implies it is an active system which works to continually reinforce your original leaf spring suspension and is extremely easy to install and requires zero maintenance once have them on your F-350. There are two different kits depending on your truck: - RoadActive Suspension Custom Leaf Spring Enhancement...
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  • RoadActive Suspension System for 2012 Ford F-250/F-350 with Factory Overload Springs
    If your 2012 Ford Super Duty has an overload spring ABOVE the leaf spring pack then you would need to use # RAS3611-SLHD. Then, to use the RoadActive suspension system # RAS3611-SLHD, the top overload spring will have to be permanently removed.
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  • Recommended RoadActive Suspension System for 2015 Ford F-250 with Overload Springs
    I have a solution for you, but the RoadActive # RAS3611-SHD are not designed to work with the overload springs on your 2015 Ford F-250. Instead, you'll want to use the RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty # RAS3611-SLHD. I've linked a review video of these systems that I recommend having a look at.
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  • Best Suspension Enhancement for 2021 Ford F-350 with Truck Bed Camper
    For your 2021 Ford F-350 you'd really only need one suspension enhancement kit installed on your truck. If you were to need the support of two you'd be most likely overloading the truck so your best option is to go with one setup that's as ideal as possible. Now the best option for suspension enhancement for your truck is the RoadActive Suspension kit part # RAS3611-SLHD for if you have factory overload springs or part # RAS3611-SHD for if you do not have the overload springs. The RAS...
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  • Best Suspension Enhancement for 2020 Ford F-350 Towing Fifth Wheel Trailer
    The RAS systems are by far the best suspension enhancement option for a truck like your 2020 Ford F-350 towing a fifth wheel trailer. You get (adjustable) suspension support which greatly reduces sag, you get improved stability and reduced sway, but unlike other options that make the ride quality rougher these actually are known to improve the ride quality. So if your truck has factory overload springs you'd want the part # RAS3611-SLHD and if you don't have them # RAS3611-SHD.
    view full answer...
  • Comparing RAS3611-SHD and RAS3611-SLHD For 2011 Ford F-250/350
    The difference in the RAS kits for your 2011 Ford F-250/350 is the RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty # RAS3611-SLHD fits trucks with the top overload springs and can fit dual rear wheel models, where the # RAS3611-SHD does not work with the top overload springs or dual rear wheels. So if your truck has the top overload springs or has dual rear wheels you will need to go with the # RAS3611-SLHD, and if your does not have top overload springs or dual rear...
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  • Best Suspension Enhancement Recommendation for 2021 Ford F-350 Towing Gooseneck Trailer
    The best suspension enhancement solution we have for your 2021 Ford F-350 is the RoadActive Systems like the part # RAS3611-SHD for if you do not have factory overload springs or # RAS3611-SLHD for if you do have them. Unlike other kits this one provides adjustable support that reduces sag like you are wanting but also does the best job at cushioning the ride quality and improving stability and handling. This by far is exactly what you are looking for based on what you described.
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  • Does RAS Leaf Spring Enhancement RAS3611-SHD Fit A 2021 Ford F-250 4WD?
    The RoadActive Suspension Leaf Spring Enhancement Kit # RAS3611-SHD you mentioned will fit your new 2021 Ford F-250 Super Duty 4WD as long as it does NOT have the top overload springs. If it does have the top over load springs you would need the # RAS3611-SLHD instead. I included videos of the products mentioned for you to take a look at.
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  • What is Best Suspension Enhancement for 2022 Ford F-350 Towing Trailer
    The best suspension enhancement we have for your 2022 Ford F-350 is the RoadActive Suspension kit # RAS3611-SLHD for if you have the factory overload springs or # RAS3611-SHD for if you do not. Unlike other options you get the best of all worlds with the RAS kits. The support is adjustable, the install easy, the ride quality is improved loaded and unloaded, and handling is improved as well.
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  • What Suspension Enhancement do You Recommend for Extending the Life of My 2022 F-250 Leaf Springs?
    I have just the thing for you. For extending the life of your leaf springs on your 2022 Ford F-250 4x4, I recommend the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-SHD (3k) or the # RAS3611-S (2k). Both of these kits provide your leaf springs with the extra support you need to prevent sway/body roll as well as sag. Also, in addition to prolonging the overall life of your factory leaf springs, these kits do not require any maintenance once installed on your truck. For...
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  • RoadActive Suspension Custom Leaf Spring Enhancement Kit For 2021 Ford F-250 Without Overload
    You will want the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-SHD for your 2021 Ford F-250 since you do not have the overload spring. The RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS3611-SLHD is for models with a top overload spring on their leaf springs.
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  • Are There Air Bags for a Lifted 2014 Ford F-350
    I do have an option for you but air bags don't work well on most lifted 2014 Ford F-350's due to the design of the rear jounce strike plate. I am not saying there isn't a kit that will work but due to their being soo many different lift kits out there, we'd need to know which exact one you have to confirm or deny. The main thing you are looking for is the location of the jounce strike plate. It needs to be in the factory location so the lift spacer cannot installed between this and the...
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