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Heavy trailers and bed loads can make the rear of your truck sag and your steering feel light. The RoadActive Suspension Custom Leaf Spring Enhancement Kit (RAS3611-CHD) adds up to 3,000 lbs of load-leveling support by turning your leaf springs into a mechanically active suspension system. The variable-rated coil tension springs automatically adjust to your load, keeping your ride level whether you’re towing a trailer or hauling a full bed. You get better balance, traction, and braking control without changing how your truck handles when unloaded.
Axle wrap and wheel hop can shake your truck and make it hard to keep traction when accelerating or braking under weight. The RAS system stabilizes the leaf springs so they stay bowed and absorb load forces instead of twisting. That stops wheel hop before it starts, eliminates bottoming out, and reduces the strain on your shocks, shackles, and tires. It’s a clean mechanical solution that reacts instantly without air lines or hydraulic delay.
When you hit curves or deal with crosswinds while towing, sway and body roll can make the ride stressful. The RAS reinforcement keeps the rear suspension tight and balanced so the truck feels planted in turns. By cutting down on side-to-side motion, it helps prevent sway from a trailer shifting behind you or body roll when cornering with a tall load. The result is steadier handling and more confidence at highway speed or on mountain roads.
Installing load support shouldn’t require drilling or constant tuning. The RAS kit comes fully assembled and bolts right onto the factory U-bolts and leaf spring eye with included hardware—no drilling, cutting, or welding required. Once it’s tensioned during installation, it doesn’t need air pressure checks or ongoing adjustments. You can even fine-tune the coil tension during setup between 25% with the 1mm spacer and 40% with the 2mm spacer to match your typical load range.
Hauling in tough weather means you need hardware that won’t rust out after one season. Each RAS unit is made of high-grade alloy steel with an epoxy e-coat on the coil springs for extreme corrosion resistance. The end brackets are corrosion-resistant with a salt spray rating of more than 800 hours, so they stay solid through mud, salt, and road grime while continuing to give firm support year after year.
Customer Satisfaction Score:
81% were satisfied with this product
19% of customers were not satisfied
Ratings & Reviews
Travice
4/18/2026
Best product i have spent mo ey on
Brooke M.
10/21/2022
If it seems like the suspension isnt engaging when it should, you should take a look at page four of the instructions where they outline how to adjust it until it fits properly. Also, if you would like to get something that is more robust, you may like to try part # F2613. You will want to make sure you take note of the vehicles this part fits to be sure it will work for your truck.
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?
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!
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Heather A.
4/10/2025
Your install looks great! How is the RAS working for you?