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When you hook up a trailer or load down the bed, these SumoSprings helper springs step in with up to 2,800 lbs of support at 50-percent compression. They keep the rear suspension level so steering and braking stay predictable instead of light or sloppy when the back end sags. It’s a straightforward way to handle heavy hauling without adding air lines or constant upkeep.
Loaded trucks can bounce and jar over every dip in the road. The microcellular urethane design of these springs cushions those hits with progressive load control that firms up only as weight increases. The result is a smoother ride with less vibration and bounce whether you’re crossing a rough campground or a stretch of highway.
When a curve or uneven weight shifts your truck off balance, each spring reacts on its own to keep that side from dipping or rolling. That independent action keeps the vehicle flatter through turns and steadier when a crosswind or passing semi tries to push it around. It makes towing and hauling feel more controlled from start to finish.
These solid urethane springs don’t rely on air pressure, fittings, or hoses—there’s nothing to inflate or leak. They operate dependably between -25 F and 200 F and stand up to oil, salt, and UV exposure. Once installed, they’re ready for year-round work without adjustments or special care.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi everybody. Andy here with etrailer.com. Let's take a real quick look at the Sumo Springs rear axle Custom Helper Springs. Now these have been designed to fit your 2019 and newer Chevrolet Silverado 4500, 5500, 6500, both the two wheel and four wheel drive models, and then your international Truck CV series. Again, both the two wheel and four wheel drive models. On custom fit parts such as these helper springs.
I do recommend taking advantage of our vehicle fit guide here at etrailer.com. Just input the year, make, and model of your vehicle and our fit guide will confirm if these will work for you or if we have something comparable that will work for you. So as you can see, I do kind of have them loosely assembled just to kind of give you an idea of what they're going to look like when they're put together. These custom helper springs are gonna help maintain an even balanced ride. They're gonna help minimize rear sag.
And with a sturdy 2,800 pound capacity at 50% compression for your rear suspension, you can tow heavy trailers and haul substantial loads in your truck with confidence. The Microcellular urethane springs are going to give you progressive load control that's going to ensure that your ride remains comfortable and it's gonna help cushion the shocks and dampen road vibrations. So this feature is especially beneficial when you're on long RV travels, as it's going to keep your journey smooth and hassle free. The independent action of each spring is going to compensate for off-center loads. It's gonna reduce body roll, it's gonna give you a stable and safe ride.
So this is gonna be perfect for helping to avoid lean during cornering, particularly if you're carrying a significant load in your trailer or your truck. The solid maintenance-free design means that basically it's gonna be, forget it, install it, set it up, and then just forget about it. You're not gonna have to worry about constant monitoring of air pressure or dealing with tubing. It's gonna keep your preparation time minimal and let you focus on the adventure ahead. So again, these durable microcellular urethane springs are gonna be resistant to oil, salt and UV rays.
They're gonna perform optimally in temperatures ranging from negative 25 degrees Fahrenheit all the way up to 200 degrees Fahrenheit. So whether you're driving through winter snow drifts or summer heat waves, your vehicle suspensions going to remain reliable. Instructions are gonna be included for the pretty simple installation process. You are going to get some thread tight here as well. But everything that you see here, all the hardware spacers here, and again, just kind of have them loosely put together to give you an idea what the install is going to look like. Now, again, I mentioned that these have a 2,800 pound, 2,800 pound capacity but just be aware that these do not actually increase your truck's weight carrying capacity. So you wanna make sure that you're not going over your manufacturer's recommended weight limits. Now, if you happen to have any other additional questions about these springs or any other suspension enhancement systems that we carry, don't hesitate to reach back out to us. We wanna make sure that you're getting exactly what you want and need. But I think that's gonna wrap up our quick look today. I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me.
Customer Satisfaction Score:
83% were satisfied with this product
17% of customers were not satisfied
Ratings & Reviews

Claire H.
10/29/2026
SumoSprings are amazing! They're so easy because you can install them and forget and when you're towing they'll do their job without needing any extra work. What are you planning on towing?

Brooke M.
6/18/2025
Definitely less moving parts to worry about than airbags :) The install looks great! Are you hitched up in the photo to test out the springs or were you actually on your way to the water?
Condition: Installed
Notes: There are install marks from previously being test fitted.
Condition: Missing Parts
Notes: Item is missing 2 of part G (512277, the 2 small bolts.) Otherwise new and unused.
Info for this part was:
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Donald
10/8/2026
Cant believe its been a year since I installed the SumoSprings. Every time I go around a corner I so appreciate the excellent handling I now have. The Sumos have earned their 5th STAR!