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When towing or hauling, sag in the rear suspension can throw off steering and braking. These SumoSprings Rebel Custom Helper Springs add up to 5,000 lbs of support at 50-percent compression to keep your vehicle level and composed. They act as a buffer for your factory suspension, bearing the weight of heavy cargo so the front tires maintain traction and steering stays predictable whether you’re hauling tools, campers, or a trailer.
A lot of load-assist systems feel harsh when the truck is empty. The Rebel’s 2-piece design separates when unloaded, allowing full suspension movement so the ride stays smooth and comfortable on rough terrain. Each spring connects at the top and bottom, then comes together only under load for support. This way you get stability when towing and a soft ride when you’re not.
Lighter loads compress the springs easily for soft engagement; heavier loads compress them by as much as 80 percent for firm support. This progressive load control keeps your vehicle level across a wide range of cargo weights. The springs also absorb bumps and shocks, which helps minimize sway and bounce when towing or carrying uneven loads.
Each SumoSpring works independently to support its side of the vehicle. This helps compensate for off-center loads and reduces body roll during sharp turns. Whether you’re cornering with gear in the bed or pulling a trailer on a winding road, the truck feels stable and planted instead of rocking side to side.
These closed-cell urethane springs are tough enough for all-season hauling. They work from -25 F to 200 F and resist damage from oil, salt, and UV rays. Because they expand and compress vertically with minimal lateral movement, they won’t rub or get damaged in tight spaces. There’s no tubing or air pressure to manage—just a maintenance-free, bolt-on setup that quietly does its job every mile.
Customer Satisfaction Score:
95% were satisfied with this product
5% of customers were not satisfied
Ratings & Reviews
The truck is very bouncy now unloaded. I think the money is better spent on air bags.
Very easy install and product worked great. Helped most with leveling my truck while loaded with my camper. Body roll was still there but these definitely reduced it. Would definitely recommend this product.
nice improvement when 5th wheel is hooked up. maybe half inch ride height improvement. bumps and potholes are dampened nicely, not eliminated but not harsh and smoothed as should be.
The installation went very well. The ride seemed smooth.
I haven't had the springs under load, yet. I'm sure they'll perform as expected. I was not able to adjust the driver's side springs so that they align correctly. (see pic). The bottom spring does go into the top spring, but it's off enough that over time it will be an issue. Passenger side is spot-on! I have a 2024 F350 Tremor
took about 2 1/2 hours to put them on. Love them!! Trailer sits level and truck still has it's proper angle to the road!
With the new Sumo Springs my Sprinter is an amazing highway cruiser. Drives like a dream! It's a little rough on potholes, but overall a great purchase.
Ride is great unloaded. They don’t touch until you load the truck with a little weight. On a light trailer 16ft or 20ft car hauler they just touch. The ride may be a little stiffer in the rear since there isn’t much weight to keep them down or the bounce down. But it’s not bad at all. Hauling a heavy load where they get compressed the load is much more stable and the truck hauls the heavy loads MUCH better. Cheaper than air ride. No lines to run. No worry to inflate or deflate. I give them 10/10. Very nice product. If you run light loads more than heavy I would go with the blue or yellow versions. I have the 5k sumos on a 2018 Ram 3500 4x4
100% satisfied.
Still too new for me to review how the product works, but in terms of installation, I had a lot of issues with installation on my 2015 Ford F150. Everything I saw made it sound easy for self install by one person, but was pretty tough self install for me. I'm not an expert on vehicles, but generally pretty handy and I had trouble doing it by myself and took at lot of time.
Difficult parts were attaching the upper mounting bracket to the frame, and getting the bolt through a washer and into a mounting piece that I had to insert into the frame
Couple of notes. My truck is a 4x4 and the instructions said to mount the upper bracket in the bottom holes for 4x4's, but that was not possible as it wouldn't fit. After talking to manufacturer, they said it was ok to mount in the the upper holes that was supposed to be for 2wd models.
The instructions don't mention using lock tight on all nuts, but I had one the the sides come off and lost some pieces. After getting a warranty replacement, the manufacturer said to use lock tight, even though it wasn't noted on instructions man. They said in newer instructions, it adds that, but that wasn't included in the product I received
Hoping I will like the ride when I connect and use on my trailer and will reserve judgement till then
I wish I would have put on an air ride system instead. When I put my light (1750lb.)truck camper on my F250 truck, the back of the truck saggs. Not happy! I am sure the product is okay, just not what I wanted.
It’s a fantastic product and shipping was right on time. Thank you so much etrailer.
Just Installed my Sumo Rear Springs. They went in real easy on my Dodge Ram 3500. The thing that took the most time on the install was jacking up the frame 3-4" to make enough space between the axle base and top of frame to slip in the entire lower and top sections of the Sumo Springs. Once I did that, I narrowed that space by letting the frame down a little but not all the way. Just enough to catch the receiving spring and leaving a half inch gap between the two sections. This allowed me to easily rachet the bottom u-clap without a problem and keep good alighment. I know I'm going to love this product once I hitch up. No more 2' drop in the rear end once hooking up to my 15k 5th wheel. These springs are stout but no so stout I'll beat the hell out of my body when hunting the rutted roads of the great North West. Thank you Jessie for your expertise and steering me toward the perfect application to meet my pulling and off-road needs.
I put a small leveling kit in my 2500hd Silverado. I noticed afterwards towing my excavator or dump trailer I was getting some rear sag when I had my trailers loaded heavy. I considered doing air bags for the rear. Instead I installed the sumo springs. I installed them in about an hour. Very happy with them. No noticeable difference in ride quality while empty. And they keep my truck level when I’m hauling my trailers. 5 stars!
Product works very well. Only problem we had was an alignment problem on the drivers side spring. Couldn't get it completely centered top to bottom, but was close enough to still fit together.
I installed on 24 Silverado 2500hd. Install went great. They work well when towing. I haul a 32’ bumper pull camper. They help reduce the sag dramatically. When not hauling, the truck rides rougher than without them installed. That makes sense and I am happy with them. I may have went with a bit less stiffness now that I know.
Awesome addition to my F350
Fast delivery
Really like them
Easy install, works Great pulling my 5 th wheel.??
They let me know after talking to them i had ordered the wrong part and they canceled the item and sent me the correct one
Just put these on our 2014 F350. We have a 40’ fifth wheel and on a 400 mile trip. So far so good!
Adding a pair of SumoSprings to the rear axle of our 2015 F250 did little to help level the vehicle when hauling 500 to a 1000 lbs of feed or other materials. When pulling a bumper pull tandam trailer with a UTV, tractor, etc.,these springs did not hold the pickup level. We have since replace the leaf springs with OEM parts and all is better. The SumoSprings is a very good idea however did not solve our concern and probably should have saved the cost and replace the leaf springs first. Please note that this F250 does not have a goose neck hitch and it is rare to be overloaded. We use a one ton for those loads. Thanks.
Katrina B.
5/23/2023
These will not fix an already sagging suspension. These are designed to help support suspension but leaf springs need to be replaced they will not fix that much sag. I would recommend using some airbags, like part # F2703, in place of Sumo Springs. You will need a compressor, like part # F2097 for the airbags.
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Gwendolyn Y.
4/23/2025
Hey Michael. Looks like you spoke with William. I'm glad that he caught that and got you all taken care of! Have you had the airbags installed yet?