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When the rear of your vehicle squats under gear or trailer weight, handling and braking can get out of line. The SuperSprings Custom Suspension Stabilizer and Sway Control Kit adds 1,900 lbs of extra load support by mounting directly above the factory leaf springs. As the stock springs flex, the rollers on each end of the SuperSprings engage to lift and stabilize the rear. The result is a level stance that stops bottoming out and keeps steering and braking consistent even when you’re fully loaded.
Wind from passing trucks or sharp curves can make a heavy vehicle feel loose. These helper leaf springs work like sway bars for your rear suspension, reducing body roll by up to 30 percent. By keeping your OEM springs from twisting, they make highway driving steadier in gusty weather and cornering more controlled when weight shifts side to side.
Unlike air spring systems that need constant PSI checks or hoses to manage, SuperSprings automatically adjust to your payload. The rollers activate only when your factory springs flex under load and release when they don’t, so you get support only when it’s needed. There’s nothing to inflate or monitor—just consistent performance mile after mile with no upkeep required.
Every setup and load is different. The shackles that connect the SuperSprings give you several installation options for tuning ride height and support. Use the upper bolt holes for constant heavy loads or older suspensions showing fatigue, the lower holes to maintain factory ride feel, or a mix of both ends for balanced comfort and lift. It’s an easy way to match your suspension response to how you actually use your vehicle.
Installing extra support shouldn’t mean tearing into your truck. This kit bolts right on above your existing springs with no drilling required. Dense polyurethane blocks seat between the SuperSprings and factory springs to prevent shifting, making for a clean fit you can handle with basic tools. Once installed, you’ve got an automatic helper system that strengthens your suspension and extends the life of brakes, tires, and factory components.
Customer Satisfaction Score:
88% were satisfied with this product
12% of customers were not satisfied
Ratings & Reviews
The shackles on each end were too narrow to clear the spring clips so locating them was harder than need be. The instructions had a mistake, locating the front shackle incorrectly. Installed as they are. Improved ride a lot. Glad I got them.
Fast delivery, free shipping, the springs went on pretty easy, had some problems with install due to my vehicles configuration, Travato59K,not the springs. This was a 2024 RAM Promaster3500, raised it up 1.75” on the lower setting. Noticeable help with sway problem.
Exactly what I needed and what I wanted very fast shipping thanks E trailer
While use the middle setting it only gave it a slight lift with a minimal unloaded bounce. Usually never overload the trucks maximum capacity but needed to for a short distance and with approximately 1300 pounds in the bed, the truck didn't squat at all.
This was a great addition to the suspension of my 2021 Ford E350 Class C RV. The rear springs were at almost max load. This raised the chassis at the rear axle almost 2-inches. This is a heavy duty spring and I had to fabricate a tool to compress the spring.
Worked just like SuperSpring said, they Stabilized the load and reduced the sag with a very heavy Truck Camper also the ride without the camper is not horrible just a little stiffer.
Fit great on my 2025 Ram. I makes a big difference pull my 14000lb 5th wheel. Highly recommend these for any heavy loads. I have put these on 3 other trucks and they are maintenance free. You don't need to worry about the load you are hauling.
Excellent service and fast delivery.
Excelente
These worked great crossing the country last month.
Pretty sweet. Immediate and noticeable improvement for my sprinter conversion. Disappointed I waited so long to install.
I have used the Superspring product on many Mercedes 2500 Sprinters.
The factory springs typically struggle to support the laden weight of the vehicle after it has been built out.
This helper spring is an excellent option to increase the capacity of the sprung weight in the rear of the vehicle.
I am 100% pleased with etrailer...received wrong suspension because of manufacturer's misrepresentation...Tiffany at etrailer corrected everything...sent a prepaid UPS label to send it back...sold me the proper stabilizer springs...and gave me 100% credit back on the wrong purchase...these people are true to their word and I recommended them to everyone...P.S. today I installed the new stabilizers and they work like a charm...and...I talked to Tiffany on Monday the 9th...received the new stabilizers on Wednesday the 11th and installed them on Thursday the 12th...10 thumbs up to Tiffany and etrailer...thanks,
The Supersprings part went find, installed as expected. Only thing for my RV type had to remove the tire. The front SuomSpring did not go as it should. The bolts are the same size as the holes in the frame. Had to really drive it in. I have a 2006 Pleasure Way Class B RV. Had to remove a few other items first to get it all to fit.
I really haven’t had a chance to see how the super spring perform. I suspect they’re going to be awesome.
You should inform customers about special tools needed to preform install. Not on easy install as stated in video
These leaf springs works great !! More stable my van but I would like that it brings up an inch !!! Great buy
I have the Yakima EXO Swing Away Storage System w/ 2 Enclosed Cargo Carriers - 2" Hitches on my 2025 Airstream Interstate. They were causing the van to sag. The Springs went on Fairley easy and provided the lift I needed.
Added these to my Mercedes air stream 19x class b van that already has 2 leaf springs. Had swaying issues at 60MPH and up. These put a stop to it right away and kept from sagging in the rear when loaded up with all our gear and water tank full. I have them on the mid setting. My van is 4wd and already lifted so didn’t raise it more than 1/2in. Still has a smooth ride and no big jolts like air bags or sumo springs.
I bought these a year ago so not sure if anything has changed Bad thing is they are slightly too long, Just enough to touch the wheel well and rub the under coating off. If you’re going to install yourself, I found a good you tube install. The U-bolts for install are too short. Need 2 forged C-clamps.
These are a 100% buy, don’t mess with air bags or sumos. These adjust themselves with load or no load.
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