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Heavy loads can make a truck squat, throwing off steering and braking. This SuperSprings Custom Suspension Stabilizer and Sway Control Kit adds 2,500 lbs of load support by mounting helper leaf springs above the factory springs. The extra leafs automatically engage when the original springs flex and lift the rear end to prevent bottoming out. You keep a level stance even when towing or hauling heavy gear.
Crosswinds, sharp turns, or passing semis can make a loaded truck feel unsteady. The SuperSprings act like sway bars by stabilizing the factory leaf springs and keeping them from twisting. This setup reduces body roll and sway by up to 30 percent for smoother cornering and better control on highways or mountain roads.
There’s no tubing or air pressure to check—these helper springs work automatically based on how much weight you’re carrying. Rollers at each end engage when the suspension compresses and release when unloaded, so you don’t have to crawl under the truck or fine-tune anything. It’s a simple, maintenance-free way to add support without compressors or valves to adjust.
The shackle design gives you several installation settings to fine-tune ride height and support. Use the upper bolt holes for more lift and firmness under constant heavy loads, the lower holes to maintain factory ride comfort, or a mixed setting for balanced performance. This flexibility lets you tailor how much help you want from your SuperSprings without changing parts later.
Installation is straightforward—just bolt the SuperSprings above your existing leaf pack with no drilling required. Poly spring pads are included for models with factory top overload springs to keep everything seated properly. By reinforcing the suspension this way, the kit helps extend the life of your brakes, tires, and factory leaf springs while keeping your ride stable mile after mile.
This kit is designed to fit a vehicle with factory top overload springs. As shown in the picture above, a top overload spring sits above the factory leaf spring pack.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Speaker 1: Today we're going to be taking a look at the SuperSprings lines of custom suspension stabilizer and sway control kits. You'll want to use etrailer's fit guide to determine the correct kit for your vehicle. Here's what our SuperSprings are going to look like once we have them installed. Now these are going to give us the support we need whenever we're hauling a heavy load or towing a heavy trailer. Typically, whenever we're hauling something extremely heavy our suspension wants to flex a lot and our back end sags down. Well these are going to provide us the extra support by activating whenever our suspension flexes, the rollers on the end of our leaf spring are going to activate our helper spring and provide us that extra support.
But also still giving us a nice ride when we're not towing something heavy, because it's going to deactivate those springs and still have a nice comfortable ride.And since they are attached to the front and back of our factory leaf springs, it's also going to act like a sway bar and it's going to prevent our leaf springs from twisting. Giving us a lot more stability when we're driving down the road. The multiple notches in the end here are going to provide us with a little bit of customization, depending on how much support we need. If we need more or if we just have a little bit of spring fatigue in our truck, it'll give us that little bit of lift so whenever we're towing something we don't have quite as much sag.We have a water tank in the bed of our truck as a heavy load or to simulate the tongue weight of a heavy trailer or a fifth wheel. So as I take the truck through my test course, I can definitely tell that there's a load back there.
The engine doesn't seem to be straining that much, but the bumps are extremely harsh and I can definitely feel it resonating through the seat. When I come to the slalom course and I'm going through the turns it definitely has a lot of body roll and I just generally feel like I need to slow down because it feels like it's leaning a lot and it's not responding quickly enough to the turns.The SuperSprings installed and I have the same load back there. When I'm driving through our course I can immediately tell a difference. The bumps aren't as harsh because the truck isn't sagging down as much and there's a little bit more support back there. But really where I tell a big difference is through the slalom course.
It definitely feels way more stable and even taking the turns going in and out, it just feels like it really wants to stick to the ground a lot better and just generally wants to go faster.Compared to airbags, these are a maintenance free option with no tubes to run or air pressure to maintain. Similar to airbags you can customize the level of support provided. Unlike airbags however you do this during the installation and set it one time rather than on the fly adjustability you get with airbags.And that completes our look at the SuperSprings line of custom suspension stabilizer and sway control kits.
Ratings & Reviews
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!
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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?