RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty
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2016 Subaru Legacy
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2016 Subaru Legacy
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When you’re towing a camper or hauling a heavy bed load, sag and squat can throw off your steering and braking. The RoadActive Suspension Custom Leaf Spring Enhancement Kit adds up to 3,000 lbs of extra support by turning your factory leaf springs into a mechanically active suspension system. It keeps your ride level under weight so your tires maintain traction when braking or accelerating, and your headlights stay aimed where they should.
Big loads shouldn’t mean a harsh ride when empty. The variable-rated coil tension springs automatically adjust to your load so they activate as soon as weight is applied and disengage when unloaded. That means responsive support when you need it and comfort when you don’t. Each spring can be set during installation between 25% and 40% tension with the included spacers, giving you the right balance for towing or daily driving.
Cornering with a trailer or cargo can cause sway or roll that makes handling unpredictable. This system strengthens the leaf springs to reduce dangerous sway, body roll, and bottoming out while stabilizing your load. By absorbing load force energy before the springs flatten out or twist, it also eliminates axle wrap and wheel hop for smoother traction and steadier control through turns and curves.
Each unit is built from high-grade alloy steel with an epoxy e-coat finish for outstanding corrosion resistance. The end brackets are rated to over 800 hours of salt spray exposure, so they stand up to water, salt, and road grime. Once installed, the setup is maintenance-free—no air lines or monitoring needed—so you can focus on driving instead of adjustments.
Getting real suspension support doesn’t have to mean drilling or welding. This heavy-duty kit comes fully assembled with all required hardware and bolts directly to your existing leaf spring and factory U-bolts. Just mount it up, set the tension, and hit the road with confidence knowing your suspension is ready for whatever load you throw at it.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi everybody. Andy here with etrailer.com. Let's take a real quick look at this Road Active Suspension custom leaf spring enhancement kit. Now this kit has been designed to fit your 2014 and newer Ram Pro Master 1500, 2500, and 3500, and on custom fit parts such as this kit, I do recommend taking advantage of our vehicle fit guide here at etrailer.com. Simply input the year make and model of your vehicle and our fit guide will confirm if this will work for you or if we have something comparable that will work for you. Now this heavy duty system is gonna transform your ProMasters factory rear leaf springs into a bold, mechanically active suspension system.
It's gonna automatically strengthen those springs, providing you with improved ride quality regardless of your load and maintaining that smooth driving field whether you're towing a trailer or running errands unloaded. You just have a weight capacity of 3000 pounds for the rear suspension. So it's going to take on everything from trailers to heavy camper vans very easily. Now, if you've ever felt like your trailer was swaying or your vehicle was leaning drastically in a turn, this system is gonna tackle those common nuisances head on. By absorbing and equalizing the weight this system is gonna drastically cut down on sway and body roll.
That's all too familiar with heavy loads. This is gonna offer superior stabilization reinforcing your vehicle's load and limiting rocking motion so you're gonna feel safer even in windy driving conditions or when passing large trucks. Now one of the standout features is the adjustable coil tension springs. You're gonna be able to tailor it to your unique needs at installation by choosing from two tension settings plus any required adjustments in between. So whether you're balancing a heavy camper van or hauling uneven loads like handicap lifts, you can get side to side leveling for improved ride handling and personal comfort on every trip.
So just to kind of give you an idea of how this is gonna be installed on your springs, there's an image I have there on your screen showing you what this is going to look like when it's installed. So it's relatively overall a a pretty simple install. So whether you're loaded or unloaded, these springs are gonna respond instantly. They engage immediately under load to maintain your leaf springs curvature. So that's gonna help prevent sag and it's going to ensure all tires maintain grip on the road for optimal traction.
Not only does this improve your towing experience, but it's also going to to ensure that your headlights in correctly and your drive remain smooth without those unsettling jostles or jolts. It's gonna make towing that trailer or hauling that camper feel effortless and secure with this solution. So again, this does have a weight capacity of 3000 pounds. However, an important note to make is these do not actually increase your vehicle's weight carrying capacity. So you do wanna make sure that you're not exceeding your manufacturer's recommended weight limits. You are going to get instructions to walk you through the easy installation process. And if you do pick this kit up, we would love to hear back from you regarding your experience with getting these installed and using them so you can share your experiences with us by dropping a comment or leaving a review on this product page. And if you have any other additional questions, don't hesitate to reach back out to us. We do wanna make sure that you're getting exactly what you want and need. Well, that's gonna wrap up our quick look today. I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me.
Ratings & Reviews
Michael
8/1/2025
I still think these springs are one of the best aftermarket purchases Ive made for this truck. Obviously, different trucks will give different results, but for me not having to hassle with a WDH I just use a sway bar makes all the difference. Before the springs, I would towwith a WDH and sway bar and constantly felt the trailer behind me or felt I was floating in the front end. These springs have *almost* completely eliminated that. Amazing difference.
Lazer S.
8/1/2025
Richard
5/1/2026
1-year comments - As mentioned, traded the F-150 for a Tundra. RAS did make a noticeable difference in handling of the travel trailer and body roll of the truck even when not towing. I can only guess but would recommend going with standard model over HD as ride was stiff with light load in the truck and not towing. Upgrading the suspension on the travel trailer made the most difference in overall stability. New slightly higher rated leaf springs, Morryde equalizer, and wet bolts, combined to greatly lessen the body roll of the trailer which led to a much more stable drive especially with side wind loads. RAS is nice and worked to give the F150 more strength for when towing or when more heavily loaded. So still give it 4 stars.
Claire H.
5/1/2026
Brooke M.
5/13/2025
Really glad to hear that, James! The RAS is really good at its job for sure! Thanks for sharing the photo of your set up - the Airstream and truck are looking mighty fine! When's the next camping trip?
Heather A.
4/10/2025
Your install looks great! How is the RAS working for you?
Travice
4/18/2026
Best product i have spent mo ey on
Jeff
4/11/2026
The RAS is a great addition to the stock leaf springs on my F250. I have in the past year towed my 36’ Jayco travel trailer from Ontario to Nova Scotia and from Ontario to South Georgia. About 1700 miles total. From the 400 series highway the Trans Canada highway and the inter state highways the RAS along with the Fast Way E2 weight distribution and sway control system, my bumper tow is locked in and stable. The RAS reduces body roll on the tow vehicle eliminating the magnifying effect body roll has on the sway of the trailer. No white knuckling in cross winds or passing transport trucks on the interstate highways. Highly recommend to compliment the rear truck springs for towing heavy loads.
Kate F.
3/26/2026
Glad we had the part to get rid of the sag Allen! What kind of system do you have in the bed?
Brooke M.
6/24/2025
That's awesome, Art! Kudos to you for going ahead and tackling the job. Are you pretty comfortable with this type of work in general? The photos are great, too!
Jim
1/9/2025
Been a year now and I’ve pulled my 9200lb arctic fox trailer from Illinois to Halifax NS and back. The tongue weight was 870lb and the payload weight of the truck was maxed out from the Ford towing program and the CAT scale. The weight distribution hitch and this allowed for a very smooth ride even in the rain. The only issue was when the crosswinds were more than 10mph. The winds coming home out of Canada were 30mph and that was anxiety inducing especially coming across the mountains. Without the RAS I wouldn’t have even tried it. This was necessary to level the truck and have it track. I bought the trailer TPMS also because a blowout at that weight leaves no margin for error. Get the RAS for your light duty truck but don’t ignor your max weights. The rear axle weight was the limiting factor without the RAS and the WDH. The only drawback is the Ford headlight leveling sensor on the rear drivers side axle sits awfully close to the clearance of the shock and careful positioning is called for.
Victoria H.
3/12/2025
That's awesome Michael! I'm glad these made a noticeable different in your ride quality. Thank for including your valuable insight with your feedback along with the photos! I know this will be very helpful information to someone gearing up to install these in the future!
Paul
7/23/2025
It has worked out very well. Actually, better than I expected.
Jon G.
7/23/2025
Michael
12/25/2021
Its been a year since I installed my Roadmasters. Would I do it again? Absolutely! They have made my travel trailer pulling such a better experience. In addition, my daily commute has been a pleasure as well.
Tracey T.
4/29/2022
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!
Brooke M.
6/26/2024
Wow, that is awesome to hear a product really deliver on what its made to do! Youre a competetive shooter? Thats so cool. I could never do that - Im such a bad shot I wouldnt hit water even if I fell out of a boat. Do you travel across the country or do you stay more local?
Keith
8/27/2023
Its been really wonderful. 10k 5er on my 07 2500hd classic ccsb and I can definitely notice an improvement in handling, including less porpoising. Towed it a couple times since, including a 7 hour drive. Very happy. I recently replaced the old wornout front bumpstops with sumo springs monsters and saw additional improvement. Neither hurts the unloaded ride, just better all around!
Dave H.
1/30/2022
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.
Steve
9/12/2025
Great, these springs gave my truck stability and the ideal ride height I needed to pull my trailer with minimum sway. I would definitely purchase these again.
Lee
10/29/2025
After having the RAS for awhile now.. It is a great upgrade to the F150 towing system…Well worth it
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Claire H.
9/15/2026
I'm glad to hear you're already feeling the difference with the RoadActive installed! What are you planning on towing/hauling that you wanted extra support for?