To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
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.
When towing or hauling, rear-end sag can throw off your steering and braking. The RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty adds up to 3,000 lbs of variable-rated support to keep your ride level and in control. The coil tension springs activate automatically when weight is added, supporting the load right away and helping your leaf springs maintain their bowed shape. This keeps your tires planted, improves traction while braking and accelerating, and keeps your ride stable without adding harshness when unloaded.
Heavy trailers and bed loads can make the rear of your vehicle sway through curves or crosswinds. This system strengthens your factory leaf springs, reducing sway and body roll before they start. The mechanically active design absorbs load forces instantly, improving handling and control whether you’re towing a 5th wheel or hauling gear in the bed. You’ll notice steadier steering and less rocking motion on windy highways or when larger vehicles pass by.
Under heavy torque, factory leaf springs can twist and cause wheel hop that jerks the rear axle up and down. The RAS kit stabilizes those springs with a coil tension design that absorbs the load’s energy before it causes axle wrap. That means smoother acceleration, less vibration, and added protection for your shocks, shackles, and tires over time.
The RoadActive Suspension kit ships fully assembled for a simple bolt-on install—no drilling, cutting, or welding required. Once fitted under the leaf spring using the existing U-bolts, it’s ready to work without any adjustments or air pressure to manage later. The epoxy e-coated steel construction and corrosion-resistant brackets (salt spray rated over 800 hours) keep it performing season after season with zero maintenance needed.
Customer Satisfaction Score:
93% were satisfied with this product
7% of customers were not satisfied
Ratings & Reviews
Jenny N.
10/18/2021
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 and compressor system part # AL25856 which will give greater adjustment to the loads that are carried.
Helpful Links
James
8/5/2021
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
Katrina D.
8/15/2024
Oh no, that is not good to hear. Let me get that sent out to you right away so you don't have to locate it yourself.
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?
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
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.
Do you have a question about this Vehicle Suspension?
Info for this part was:
At etrailer 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.
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.