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.
Heavy trailers and full beds can make the rear of your vehicle sag and throw off handling. This SuperSprings helper spring kit adds up to 1,500 lbs of extra rear suspension support to keep things level when towing or hauling. The extra leaf springs work with your factory setup to reduce sag and sway by up to 30 percent, helping you maintain steady steering and braking no matter how much gear or cargo you’re carrying.
When wind gusts or passing semis push your vehicle around, the SuperSprings act like a sway bar to keep your rear suspension stable. The rollers on each end activate automatically as your factory springs flex under load, giving you extra stiffness only when you need it. That means less body roll in corners, smoother highway tracking, and better control when the weight shifts while towing or hauling heavy gear.
These helper springs adjust themselves based on your load—no air pressure or tubing to manage. When your vehicle isn’t loaded, the rollers deactivate so you keep close to the factory ride feel. Choose from multiple shackle settings to fine-tune how much support you want: a higher setting for constant heavy loads, a lower setting for a softer unloaded ride, or a middle position for balanced comfort and lift.
There’s no drilling required to get these springs in place. The kit bolts above your existing leaf springs with the included mounting hardware and extended U-bolts for packs up to 2-3/4" tall. Once installed, the system is maintenance-free—no compressors, fittings, or air leaks to worry about. You just bolt them on and let them handle the work every time the load comes on.
Alternate Instructions
Ratings & Reviews
Mike L.
2/8/2019
If you look at page 4 of the instructions which Ive linked for you, you can see photos showing a single leaf spring set up just like whats shown in the photos you provided thanks for the photos!. Im guessing that page was not included in your instructions for some reason.
Helpful Links
Timothy
2/9/2020
Springs are working wonderful after I figured out the install,. The initial problem was all my fault for being a man and not really reading the instructions haha. All is well
Brooke M.
6/11/2025
That's awesome, Douglas! Great to know these have been the solution you were looking for. The Timbrens are known to be pretty stout for sure. I can totally see how these would have the right amount of give needed to support the camper and have a smooth ride :) Have you taken out the truck and camper recently?
Conrad
8/19/2021
After about one year, these are still working great. I typically use my truck for pulling my 5th wheel. But - even when empty, you dont really feel anything different. When the camper is on, it sure levels the truck and camper out perfectly, giving you a great ride.
Victoria H.
11/11/2024
Hi Chris, there should've been a hardware kit for suspensions with leaf springs that sit above the axle. Please let me know if this is the hardware kit that was missing, and I can help you get this resolved.
Larry P.
10/3/2022
They work great, they improved the rear suspension so there is no more bottoming out when I pull the 5 wheel Rv .
Mike L.
10/1/2026
UPS is currently doing an investigation, once they figure out what's going on we'll get you an update. I'm very sorry for the delay.
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.
Howard
11/9/2020
One Year later still no sag.