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A heavy load in the bed or a trailer on the hitch can make the rear sag and throw off your handling. These SumoSprings Solo Custom Helper Springs add up to 1,500 lbs of support at 50-percent compression to keep your ride level and steady. They help your factory suspension carry the weight so steering, braking, and traction stay balanced when the rear end is working hard.
The springs use progressive load control so they stay soft for light loads and firm up as the weight increases. With lighter cargo they compress easily for a smooth, comfortable ride. When loaded down, they can compress by as much as 80 percent to provide solid support and help absorb bumps and vibration. You get a cushioned, controlled feel whether you’re running empty or hauling serious weight.
Each SumoSpring works independently to handle uneven loads and reduce body roll. When one side leans into a curve or gets hit by crosswind, that spring compresses while the other stays steady. The result is better balance, less sway, and a planted feel through turns or when loading is off-center.
Made from microcellular urethane that works in temperatures from -25?°F to 200?°F, these springs resist damage from oils, road salts, and UV rays. They compress vertically with minimal side expansion so they fit safely in tight spaces without rubbing other parts. Once installed there’s nothing to inflate or adjust—no air lines or fittings to worry about—just reliable, maintenance-free suspension support.
Installation is straightforward with no drilling required. The kit includes two jounce-style springs that bolt into place using existing hardware. Once mounted, they’re ready to work every time you load up, keeping your truck level and comfortable mile after mile.
Ratings & Reviews
Very easy to install. Normal ride unless loaded and ride is smooth, even then. Helps with porpoising when hauling a heavy tongue weight.
No issues. Always have been happy with etrailer.
John
10/14/2022
Still no issues. They work as advertised. I am happy I installed them.
Shipped fast. Easy to install. Work seamlessly. I put these on a 2018 F150 HDPP. I wanted to retain the factory ride quality when empty and have more support when loaded near my GVWR. With the 1" spacer, they nearly touched the axle (1/8" space) and make the ride very firm. So I removed the 1" spacer and the ride quality was indistinguishable from stock on all but the largest bumps. These Sumosprings engage so smoothly that you can't feel the initial contact, it feels like the springs just get progressively stiffer at a rate that is faster than the stock springs alone. Note, I slightly rerouted a cable because I thought it might contact the Sumospring and wanted more clearance for piece of mind. I don't know if this is necessary on the f150 or not, but it I know others that have done this as well. This adds a little time to the install. But still under an hour including finding misplaced tools.
Ordered the 1500lb sumo springs. The weight distribution was perfect for my F150 pulling my 25'fish house.Changing out the 1" spacers took about 5 minutes.Very pleased with the Sumo springs.
This was probally the single best improvement we did to our 2018 Coleman Light trailer. The have helped reduce the ping pong effect, reduced trailer sway when being passed by semis on the road and made the trailer easier to pull in general.
The sumosprings do help provide more suspension assistance for the pickup and a better ride.
They definitely help with towing our travel trailer!!
Keeps the truck level with minimal bounce. They do wiggle side to side on bouncy bridges/roads.
Overall happy with the purchase.
Easy to install.
Installed on my 2010 F150 XLT to help with sag when pulling our camper. Very easy to install, even with my tires on. Used my large floor jack and raised the frame to create more room. To help with the removal of my stock jounce bumpers, I sprayed PB Blaster on the end of the bolt-located in the opening in the frame. Sorry, I didn't take any pics on the project.
Ordering from Etrailer was great. Fantastic customer service and fast shipping. The Sumo Springs installed very easily in less than an hour. The additional suspension support feels like it is going to help greatly while pulling my 28' 6500# travel trailer with my F150. It has a bit stiffer ride while not towing but I'd say it is minimal. I think this is going to work well thank you Etrailer and thank you Emily in customer service!
Excellent addition to the truck and easy to install. Greatly reduces squat when pulling the RV and eliminates rear end hop when going over bumps with no load.
Shipped and arrived quickly. Easy to install in my driveway without a lift in led than an hour. Did not need to use the included spacers. Have not had a heavy load on yet, so I can't comment on how well they work.
Eric O.
9/4/2020
They work well. Definitely less sag with a trailer attached.
Massive improvement to my 2018 Max Tow package F-150s towing stability with a 7500lb GVW travel trailer. Does not eliminate chucking and such, but dampens all of the undesirable movements to a negligible level. Towed over 5000 miles with Sumo Springs front and rear, and would not tow without them.
One year later...still very happy with the Sumo Springs on the F150. I installed with 1" axle clearance so there is absolutely no change to stock ride when unloaded. When I hitch up the trailer, the Sumo Springs help reduce squat and control the ride. Truck feels more stable when towing the camper.
1 year review of Sumo springs on 2017 Ford F150. Install was very easy, initially used the 1" spacer, but ride without trailer was too rough. Removed the spacer and ride was almost as smooth as truck was originally. The springs definitely helped the ride and control when I attached my travel trailer. I would recommend the springs to anyone who pulls a trailer or carries heavy loads.
I installed these on a 2017 Ford F-150 SuperCab to stop the initial rear-end sag common with towing a trailer. These pickup trucks have springs regulated for a very smooth ride WHILE EMPTY, as most PU's are used as a personal sports car. The SSR product removes the rear sag, without causing a harsh ride.
Easy to install... no maintenance needed... no air-bags to constantly leak. I had already installed Hellwig after-market sway bars on the rear, and also replace the puny Ford OEM front sway bar with a Hellwig product. Together with the Sumo product, there is NO side-sway at all.
This product provides extra support, without detriment to the ride comfort.
I installed these last year after pulling an enclosed 12x7 cargo trailer 400 miles. The vehicle seemed soft in the rear.
I didn't need to use it for towing till a couple weeks ago when I pulled a car trailer and car 600 miles and oh what a difference. No squat, no blinding oncoming traffic no soft feeling. Just the way it should be. I left the spacer out on the install so it would ride normal unless loaded. I would recommend this product.
John D
4/18/2022
This product is great for a suspension upgrade for hauling loads on a soft spring ttuck. The fx4s rear springs are made for a soft ride. The Sumo spring turn it into a real truck and it can pull a trailer without bouncing around. Its more in between a 150 and a 250 now. Im glad I did this.
The product was easy to install. The Tools needed list needs to be updated. Removing bolt is 13mm. Installing new bolts are 15mm. Also the nuts that are tack welded inside the frame will break loose if any rust or debris are on the threads. Back up wrench is near impossible if to fit if the size is not known. End up cutting the old bolt because of this. That’s not your products fault. That’s Fords issue. With the 1” spacers provided it raise my F150 4 1/2”. Stiffened the ride up. Ready to haul my 5th wheel. NICE
Rodney
11/16/2018
The Sumo Springs are still performing well. I Hauled our 29.5 5th Wheel from Upstate NY TO Florida through a major 4 State nor’easter. We have also bought a 16’ cargo trailer and hauled it to it’s full weight capacitie. The truck is still sitting high.
I have a slide in camper on my F-150 and it caused a little sagging and some swaying in turns. The Sumo Springs do everything they say they will do for your truck. Installation took about 30 mins, the instructions were super easy to follow, 2 sockets (1-13 mm and 1-15mm and one 15 mm box wrench . After installation I could tell the difference in the handling of my truck immediately, less side to side sway and about 3 inches of lift at the rear.
Definitely worth the time and money. I would recommend these to every truck owner who hauls either a camper or a heavy load.
Pat
10/19/2021
A follow up on the sumo springs after a year of use they are a perfect solution for your trucks suspension. They greatly reduce any body sway and help level the truck I still highly recommend these springs for anyone with a truck that is hauling campers.
Pat
10/19/2021
A follow up on the sumo springs after a year of use they are a perfect solution for your trucks suspension. They greatly reduce any body sway and help level the truck I still highly recommend these springs for anyone with a truck that is hauling campers.
These things are awesome! Exactly what I was looking for to stop the sagg from towing my camper with my 2015 f-150
Jason J.
6/14/2021
Still as it was when installed. Does what its supposed to do. Only partially negative affect is the ride when using this truck for my daily communtes on Michigan terrible condition roads, makes for an extra firm bounce.
Went from air springs to these and much more happier with the ride and simplicity of these over the air bags.
This helped so much with bounce. Install was very easy on my 2018 F150 did not even need to remove the tires even with the extra 1 inch spacer. Thing to remember when you install them you put the bolt in the right hole. If you dont it will not sit right on your axle when you put weight on it. After my long trip with TT my back end did not bounce like crazy. My tuck does not have max tow so suspension is not tight. This made it like i had max tow package. After my trip I removed 1 bolt and removed the 1 inch spacer and now back to normal ride. You can leave spacer on it will make ride a little stiffer. But wife did not like that. I don't mind removing 1 bolt and add/remove spacers when needed. Also no bag to pop or leaks. People that post pics or say did not site right. Only 2 things can cause that. 1. Put into wrong bolt hole when installing. 2. Too much weight. You can't go wrong with them. They do what they said they do.
I used the Sumo spring with the RAS system. I remove the pump stops and installed the sumo(without spacer) so the axle would be one inch from sumo so the RAS does the work when not pulling trailer and sumo sumos are activated with pulling the camper. The stability it created on highway and back winding roads was really great. Feels like a totally different truck when loaded up. The RAS came with an offset spacer to move the bump stop in a better place but I didn’t need it because the bracket with the sumo springs moved the unit back and in and had plenty of clearance for the RAC system. In total they only took15 minutes each side to install once the truck was up and the tires were off. The sumo spring and RAS together were amazing and would recommend them to anyone with an F150 that need a little more support near the bumper.
This installation was on a 2014 F-150. I tow a Winnebago Micro-Mini 5th wheel with a hitch weight of 1,060 lbs.
Frame to axle stock was 7.5 inches. The Sumo springs without the spacer lifted my
PU 0.5 inches. The Sumo springs are always in contact with the axle so my ride has greatly changed. As I am an outdoorsman and travel on a lot of gravel roads fishing and hunting, I will have to remove the Sumo springs when I am not using the trailer as the ride is totally unbearable on any unpaved road.
As for using the Sumo springs with the 5th wheel, when loaded the springs compress 0.5 inches to a axle to frame distance of 7.5 inches (ie stock) The ride with the camper is very stable and there is no excessive bounce. The springs perform very well when loaded.
In my research of this product it is advertised that there is a 1 inch gap between the sumo spring and the frame to allow for a comfortable ride. That is not true and is the reason for my poor review.
Very straight forward installation. Simple. very noticeable difference under load. Towing with the gooseneck also an improvement, looking forward to the longer road trip test. So far pleased with the product and results
Richard M.
6/4/2022
after a year i could buy them again. great performance and no issues.
Ben L.
7/26/2022
My wife and I loved him on our trucks
Drove it without the camper and the ride on the gravel roads was a lot smoother. Then I rode with the camper attached and it was really smooth. I think we will be able to enjoy learning how to camp a lot easier when our old bones do not feel shot by the time we get there. This was a surprise to find that the product sold does do the job the advertising promised. Highly recommend.
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Larry
6/15/2020
Pulling my camper is no longer a “ white knuckle “ experience. These are a no brained if you have a 12 ton pickup and carry heavier loads.