SumoSprings Solo Custom Helper Springs - Rear Axle
This item does not fit your vehicle
2026 Ford Escape
These items fit your vehicle
2026 Ford Escape
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.
Towing or hauling makes your rear suspension work hard. These SumoSprings Solo helper springs add up to 900 lbs of rear axle support at 50-percent compression to keep your ride level and controlled. They help your factory suspension handle extra weight so your steering, braking, and headlight aim stay steady even when the back end is loaded down.
Every bump and dip doesn’t have to rattle the whole rig. The microcellular urethane springs compress easily with lighter loads for a softer, less bumpy ride, then firm up as weight increases to support heavy cargo. That progressive load control keeps things comfortable when empty and solid when loaded—no harshness or bounce either way.
Sharp turns or uneven loads can make the rear feel loose. These springs work independently to balance each side, cutting down on sway and body roll. The result is a more planted, controlled feel whether you’re carving through curves, pulling out of a driveway, or dealing with uneven trailer weight.
Made from durable microcellular urethane, the springs resist oils, road salts, and UV damage while working in temperatures from -25 F to 200 F. They compress vertically with minimal side expansion so nearby components stay protected in tight spaces. With no air lines or pressure to monitor, the setup is completely maintenance-free once installed.
Getting extra suspension support doesn’t have to be complicated. The custom-fit jounce-style springs replace the factory bump stops and mount using existing points—no drilling required. Once in place, they’re ready to handle bumps, sway, and heavy loads without any ongoing adjustment.
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
Ratings & Reviews
bumpers act as designed, coupled with front and back sway bars they make up a good correction to the rock and roll of the Mercedes 3500
90-95% improvement road sway, rocking without affecting ride (doesn't feel any rougher) '14 mercedes sprinter 24b solera.
10 min job after jacking, blocking rig.
Easy to remove with rubber mallet.
Slips right back in place.
Definite improvement.
After installing the rear Sumo Springs I purchased from etrailer, I did a test drive and immediately felt an improvement in side-to-side sway. This is a great product and, as usual, etrailer customer support is as good as the products they sell.
These Sumo Springs were recommended by a couple of others on an RV forum (3500 Sprinter chassis) I subscribe to. They were shipped and arrived in a timely manner. I had them installed at a local shop today (only took them 15 minutes - I most likely could have done it myself but opted not to). At this point, just driving into and out of a couple of shopping areas, the rear "thrashing about" when one thinks all the glassware is about to come flying out of the cabinets is greatly reduced.
I added these along with the sumo springs on the front to my Dynamax isata 3 (2021 sprinter chassis). I absolutely love how it took away the sway while driving in wind. Did not effect the quality of the ride just greatly improved the handling.
I have a 2014 Winnebago View on a Mercedes 3500 chassis. Installed these replacement bump stops along with a Hellwig sway bar. First, they really are as easy to install as the instructions suggest. The most difficult part was figuring out how to get the floor jack high enough.
Second, after these two minor upgrades that took about 2 hours to install, I can not believe how well the coach handles now. Unbelievable improvement for little $$$ and easy installation.
I would recommend to anyone.
etrailer has always been super easy to work with on top of the products, I initially ordered the wrong bump stops (2500), easily exchanged for the proper items.
I ordered these, hoping they would smooth our ride a little. They arrived today at noon. By 3 PM, they were installed. Test drive was great. The old rubber stops that MB puts on are worthless in my opinion. They don't even come into play until you have hit a pothole or something that forces the shock to compress. As a result, you feel a pretty solid clunk. These Sumo Springs are always in contact with the axle providing support. A much better design.
Installation did require removal of the wheels so I used it as an opportunity to check my rear brake pads. Bonus!
The Sumo Springs significantly reduced the roll in my class B rv. They also assist with reducing the roll impact of wind while at higher speeds. I have suitable jacks and jack stands and these were easy for me to install. There was an on line video on installing them which was helpful.
Ride quality and stability greatly improved. My wife loves this mod to our RV. And it was simple to installed especially with a hydraulic leveling system already on the RV. Another reason for getting these were for more ground clearance or the leveling pads. Great purchase on many levels.
08 Winnebago View on an 07 Sprinter chassis. To reduce the side-to-side rocking that is inherent in this tall, narrow, heavy vehicle, I decided to try the Sumo SSR-335-47's on the rear bumpstops. Using the vehicle bottle jack, I raised the rear tires almost off the ground, one side at at time, to provide enough room to fit the Sumos into place. The old bumpstops simply pop out with force from a couple of screwdrivers, and the Sumos simply slide into the existing brackets. The fit is precise and snug. I put soapy water on the brackets and applied a bit of force to wedge the Sumos into place. It's that simple. The difference is pronounced, with significantly less rocking over minor road undulations. I'm impressed with this product, and wish I'd done this simple modification long ago.
typical of many installations, the first side took 45 minutes, the second took about 8! I used 4" C clamp to compress the OEM bump stop laterally and that made it very easy to remove. Use LOTS of soap to aid in installation of Sumo Spring into nesting bracket. First impressions are favourable. Sway over curbs in parking lots significantly reduced and unit is much more stable at rest while walking inside. Took it on a short test ride and you can feel the difference but did not have top deal with crosswinds or semis, long term hard to tell. This is a low cost, high value upgrade to my Mercedes Sprinter RV
I installed both the front ( SSF-106-40-47) and rear (SSR-338-47) SumoSpring suspension enhancement devices on my 2015 Winnebago View which is on a Mercedes Benz Sprinter chassis. The vehicle is a bit top heavy and cross winds made the coach sway back and forth as did entering and leaving driveways and cornering on sharp curves. At times, this was scary and I was afraid it would lose control. I had a professional body shop install these for me for a very reasonable price, and upon leaving their shop, I felt the difference immediately. When I saw the original equipment pieces, I thought they were a joke. These new items touch the suspension at all times on the rear and are only 1/2" away from contact on the front. This has been a slightly over $400 investment in driving safety and is worth every cent. I literally said "WOW" out loud as I entered the freeway ramp: minimal sway with a good feeling of control. I highly recommend these devices.
Received shipment promptly- as usual with E Trailer. Removal of old bumper took 8 sec. each with a small pry. I jacked the frame up approx. 2 inches to allow for the clearance required by the new SumoSprings. I used a 6 ton bottle jack and a large wooden block. The rear wheels stayed in contact with the ground. The "springs slide into place as per the instructions. I used a wide blunt chisel to push them into place. Total time including collecting tools, taking photos, installation and cleanup was 50 mins.
Now the good part- noticed a decrease in buffeting at interstate speeds and a decrease in "floating on "washboard road surfaces.
Movement when stepping into the cabin is now negligible. Great Product!
I have a 3500 Sprinter RV. Had the SumoSprings installed front and back for $135 at an independent RV service center that also handles RV's. They had never installed them before. I gave them the installation instructions and some advice I learned from some online videos. Sprinter is unloaded at present but notice it handles better going around turns and curves in that it doesn't lean as much and feels very stable. Need to take on a trip to see how it handles when loaded. I noticed a sort of squeakiness I am not sure was there before. I need to drive it more to determine it is from the SumoSprings.
I originally purchased these to use as a overload system for a motorcycle carrier on my class B sprinter van. What I quickly realized was a tremendous change in the stability of the vehicle in turns and crosswinds which the SumoSprings provided. I have already recommended them to several friends and sprinter owners I have met on the road. These were fairly easy to install taking about 20 minutes to install per side. Thanks
2017 Winnebago View 24G Sprinter Chassis: The rear Sumo Springs definitely reduced the tendency of the stock suspension of bottoming out on bumps & pot holes and was way less expensive and simpler than installing an airbag suspension kit.
Happy Camper.
Installed the black sumo only 2 wekks ago.Should have done that right after reception last year. Reduce sway totally when i leave my yard(3 inches bump). Don,t need stabilizator,floor is very solid and stable. On the road test for only 10 miles, there is a much better stability. I already have yellow sumo on front suspension where suspension was weak and direction instable.those problems have disapeared. Very satisfied client.
07 view sprinter 2006
Mike L.
11/2/2018
We are glad to hear that the new SumoSprings you purchased are working well for you. Please keep in mind that suspension enhancement products like these are intended for use on suspension systems that are in good working order.
Fairly easy to install and made a big difference on our 2019 Navion.
I installed the rear sumo springs (with a little difficulty ) and test drove my 2017 Winnebago View and just adding the rears helped alot with reducing leaning on slow speed turns.
Will install front Sumos when I get a chance. Little room to work, access to to the nut is challenging.
etrailer delivered everything early and in perfect condition
Paul
11/30/2019
The rig handles much better with the Sumo Springs , particularly on city streets. It corners sharply without the massive body roll and turning into sloped driveways , the rolling is greatly reduced. Very happy I added these to my Sprinter Chassis.
Easy to replace existing bumpstops by using the jack of my 2015 Winnebago View to elevate each side (with safety jackstands). Take a large screwdriver to pry existing unit out. New unit easily slides innand seats properly. When coupled with matching SumoSprings for the front, the ride stability and quality is enhanced significantly! Well worth the investment!
Peter M.
10/5/2020
Review still stands as written one year ago!
Installation was quite easy, the hardest part I had was finding the sweet spot to get the second one started! The first one went in just like the video showed. It took me about 45 minutes to 1 hour to put these in and some of that time was going to get tools.
It is so refreshing to work with a company that is organized and communicates well and follows up on questions and sales!!!! I have not had the opportunity to work with you much but have several personal projects coming up and will come straight to you. Have already told a couple of friends about your service. Keep up the great work! Dalton was my contact. Also keep up the reviews on products you do on line, it really helps.
Bruce Gregg
I put Sumo springs on my 2018 Sunseeker 2400 WS with the MB chassis. They made a huge difference in stability and ride. No more rocking side to side also eliminating a slite shimmy at 65mph. I installed both front and rear,easy to do yourself.
The SumoSprings Helper springs have too much clearance between the spring and the axle. Probably because I have helper springs on the rear axle which raises the Sprinter somewhat.
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.
Brooke M.
3/26/2025
With how it handles now, I bet that is both literal and figurative :)