To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
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Heavy trailers or bed loads can make the rear of your truck sag and throw off handling. The SuperSprings Custom Suspension Stabilizer and Sway Control Kit adds up to 3,000 lbs of rear suspension support by mounting above your factory leaf springs. As the stock springs flex, rollers on each end of the helper springs automatically engage to lift the rear and prevent bottoming out. That extra support keeps your truck level and stable when towing or hauling heavy gear.
Crosswinds, passing semis, or sharp corners can make a loaded truck feel loose. These helper leaf springs work like sway bars to keep your factory springs from twisting. They reduce sway by up to 30 percent for more stable highway tracking and better control through turns or in windy conditions. With steadier suspension action, steering feels more confident and braking stays consistent under load.
Different loads call for different suspension stiffness. The SuperSprings kit uses shackles with multiple bolt-hole positions so you can pick the setup that fits your use. Use the upper holes for constant heavy loads or to offset aging springs, the lower holes to keep a factory-like ride, or one of each for a balance of height, support, and comfort. The springs automatically adjust as load changes, so there’s no need to mess with air pressure or valves.
This system bolts right on top of your existing leaf springs with no drilling required. Dense polyurethane blocks seat between the factory springs and the SuperSprings to prevent shifting on models where needed. There’s no tubing, compressors, or air fittings to maintain—just a simple mechanical design that reinforces your suspension every time you load up. By helping distribute weight more evenly, it also extends the life of your brakes, tires, and factory components for long-term reliability.
Ratings & Reviews
Nick S.
12/1/2025
That is great to hear! I am glad this addition has worked well for your setup. What RV do you have that you added this too?
Nick S.
12/2/2025
John
9/3/2026
The product works great after a year. I highly recommend the super springs for any heavy loads. After they are installed you never need to worry about the load.
Jerry B.
9/3/2026
Gwendolyn Y.
4/23/2026
Thanks for your feedback, Bob! We’re glad to hear the shackles made a noticeable improvement in your ride quality. We appreciate you pointing out the fitment challenge and the issue with the instructions, I'll pass it on to SuperSprings.
Javier G.
10/21/2025
They are working out fantastically! Now we dont bottom out and damage the sewer dump. Weve been all a long road trips and nothing is bothering us now in regards to suspension.
T
3/6/2026
Works great towing and seems to help with some sag and roll. I use them along with airbags so towing my fifth wheel is now worry free.
Mike L.
9/24/2025
Once you get the chance to tow your 5th wheel, please let us know how you like them!
Do you have a question about this Vehicle Suspension?
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Larry L.
12/29/2014
Still good! No problems to report.