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When you’re towing a trailer or hauling gear that makes the rear sag, these SumoSprings helper springs step in to keep things level. They add up to 1,000 lbs of support at 50-percent compression to help your factory suspension stay steady. The springs compress progressively—soft and smooth when lightly loaded, then firming up as weight increases—so your ride stays comfortable while your handling, steering, and braking stay consistent.
Bumps and dips don’t need to shake your load around. The microcellular urethane material cushions impacts and acts like a shock absorber, settling down road vibration and bounce. As the load gets heavier, the springs can compress by as much as 80 percent to shoulder the extra weight. That keeps the truck from bottoming out and helps even out the load across both axles for safer, smoother driving.
When one side of your vehicle hits a dip or you take a sharp corner, each spring works on its own to correct body roll and sway. That independent movement helps maintain balance when carrying uneven loads or when crosswinds try to push you around, so it feels stable and planted no matter what the road throws at you.
These springs don’t just support your load—they’re built to last through tough use. The microcellular urethane resists abrasion, oils, salt, and UV rays, and performs in temperatures from -25 F to 200 F. They expand and compress vertically with minimal side movement, so nearby mechanical parts stay protected in tight spaces. With no air lines or compressors to worry about, they’re completely maintenance-free once installed.
Getting extra support shouldn’t call for special tools or shop time. The kit comes with two jounce-style springs, custom-fit brackets, and hardware that bolt directly to your vehicle—no drilling needed. The optional 1/2-inch spacers make it easy to fine-tune engagement height if you want quicker or later spring contact under load. It’s a straightforward upgrade designed for DIY installation that gets you back on the road fast.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
I like it needs to be longer
Towing a trailer with these is a dream!
Super fast shipping. Sumo springs worked great on a trip pulling the boat to Canada.
They really improve the cornering, and trailer sag.
If your at all a DIY person you'll have no problem installing these helper springs.
The only reason I don't give them a five star review is that their just installed andvI want to see how they hold up.
Instructions were great, I didn't have to remove the rear wheels, I just used some 3" pieces of plywood with floor jack. The factory bolts (12mm) seemed to be better only because they had a washer as these hex socket bolts had a very small seat but I used them anyway. I wasn't sure the torque but tightened them to approximately the same torque as the bolts I removed. What worked for me was removing the lower two bolts, then slowly remove the side bolt and hold the original stops. Installing new one I needed 5mm for cushion, then 6mm for body bolts. There was sufficient locktite for two drops on all 8 bolts (good). I did this after work in the dark with a small flashlight. What worked for me is getting all the bolts into the body then tighten the side bolt almost all the way (so it could go up some more if needed, then tighten the bottom two bolts, then before finally tightening, loosen the side bolt a little (in case it needed to move), then tighten the bottom two bolts, then finally tighten the side bolt. I used what feels like about 30 ft-lbs. but no mention of torque. The instructions also told you which was driver vs passenger side, which is great to know before going under truck.
I should have ordered heavier option all and all well satisfied install was ez and handling improved on my 2025 Tundra
Fast shipping! No issues.
First, the downfalls:
--Less than seven days after I ordered them, etrailer starts offering an instant rebate on them....$[XX]. I spoke to trainer before purchasing, would have been nice to know.
---Driver side bracket had some issues. Had to drill out paint on one of the holes to let the factory screw go through without stripping threads. (Quality control). Also, the driver side bracket did NOT fit easily. Took me 50 minutes of trail and error to get it to fit right. Another Quality Control issue. The passenger side took 10 minutes. Looking back, should have stopped, returned them, and reordered. Perhaps I then would have qualified for the instant rebate!
These Sumo's will be put to the test this weekend as I am hooking up the trailer and taking a small trip. If they do not, I am still awaiting a response from trainer of the30-Day satisfaction guarantee they advertise on the site. I was told they have to contact the manufacturer... While they are at it, can they clarify if the blue SumoSprings are rated at 1400 (etrailer site) or 1000 (SuperSprings International site)?
E-Trailer has been phenomenal. Communication, shipping, and price was great. Easy install. Haven’t put a heavy load on them yet, but am sure they will work as advertised. Have not noticed any difference thus far in ride quality in my ‘24 1794 Tundra.
Fairly easy to install. Says it takes about 30 minutes to install. It actually took about an hour. Fortunately, I took it to a buddy of mine shop and we used his lift. Tip remove both rear tires for easier access. Do yourself a favor and don’t attach the spacer and the shock to the bracket before install. The small side of the bracket start threat it into the frame. Give yourself enough room to turn the bracket out then install the spacer and the shock. Then continue with the other two bolts. The first bolt you put in you’ll have to hand tighten with a wrench. But if you give yourself a little pivot room, you’ll be able to install the spacer and the shock to the bracket. I bought a blue shocks, which are the shortest ones. They did help level out the truck and stopped some of forward to rear sway. Personally, I wish I would’ve bought the black shocks, which are a little bit longer. They probably would’ve performed a little bit better. But overall happy with the performance.
These are fantastic if you tow an RV get them
I just received my sumosprings for my 2025 tundra so I can’t tell how they will perform but I bought them because I have had them on my previous model tundra for about five years and they really make towing my utility trailer much better, I didn’t feel any stiffer ride on an empty truck but when loaded or hooked up to a trailer the sumo springs didn’t allow to squad as much and hard bottoming down just never happened.
Fixed the sag. No more bottoming out from bumps in the road. Cheaper and less complicated than air. A+ product!
The etrailer site helped me dial-in the exact Sumo Springs for our 24 Tundra, and deliver them exactly at the stated day, enabling us to keep our installation appointment with a local mechanic. We’re looking forward to our next trip pulling an Alliance Delta 252 RL. We’ve been using a BluOx load leveling hitch with 1,000 lb bars, that relieve most of the sag already, but looking to be more level with reduced vibration. I’ll update this post after getting some miles in.
Appreciate those videos on the etrailer site - very teachable.
Incredibly fast turn around, from order to delivery, super impressed! Overall, a pretty easy install on my 2023 Tundra, even without removing the rear tires. That said, it would have been much easier to access the area to install with the tires off, there’s no doubt about that, but it wasn’t impossible. Jacked up the rear end with a 3ton floor jack (just under 20in of travel on it), set my jack stands, and that gave me plenty of room to work with. A word of advice: MAKE SURE YOU PUT THE BOLT INTO THE SMALLER SIDE OR THE BRACKET MOUNT FIRST. If you save that one for last, the factory bolt and washer will catch on the top lip of the Sumo Spring, and you will not be able to get the angle needed to get the bolt in, resulting in you needing to remove the entire thing to fix your mistake. Ask me how I know this. After the install, I drove around to hit some bumps and dips, see how it felt unloaded, and honestly, I think it rode smoother than with the factory bump stops. Loading up and towing our 26ft bunk house 600mi over the next week, that’ll be the true test. So far so good though!
Just added a set of blue sumo springs to my 2024 Toyota Tacoma off-road. Picked up my new r-pod 22 foot travel trailer 3700 pounds yesterday. Headed home with a five hour trip no squat at all with the trailer on the back.
I am only reviewing installation so far, as I haven't put them to the test towing my boat yet. However, what could be a very easy installation...maybe 15-20 mins per side, becomes much more difficult because the bracket does not allow for the use of a ratchet for one of the screws. The bump stop is just wide enough so it blocks the hex head. Only way to handle that one screw is with a traditional or adjustable wrench, and this makes the install much more difficult and time consuming. Just another 1/4 inch adjustment and you could tighten that screw with the ratchet.
Items bolted right up … took maybe 15 minutes to install… will update when I hook up the boat trailer and pull it for a few miles.. from the looks of these they will do the job quite well…
Always the fastest shipping, outstanding customer service and high quality products.
Easy to follow instructions. Maybe 45 minutes to install using no power tools. Use an 18" long extension on a deep socket allows you to tight U-bolt nuts without removing the wheels. Otherwise plan on removing the wheels to make your life easier. Also the driver side is the tighter space to work in. Do that side first. Passenger side is super easy and a great way to finish the project.
Haven't towed the camper yet to see if it reduced the squat or not.
These springs perform as advertised. They were easy to install on my 21 Bronco and I have not been disappointed. I've pulled a trailer from Texas to Utah multiple times with my Bronco and I have not experienced any squatting. I also haven't noticed any decline in comfort of my ride. I highly recommend if your looking for helper springs for trailering.
Best customer service out there. You delivered when no one else could. Thank you!
I put these on our Bronco Outer Banks to tow our teardrop off road camper. It made a huge difference in the ride and handling. Highly recommended.
Good product on my 23 Bronco 2DR would not fit in the orientation suggested with the U bolt closest to the wheel on the divers side although this orientation did work on the passenger side. Would suggest most important thing is to line up with where product is going to hit frame rail. I carry a large dirt bike on a motorcycle tongue rack. With billstiens dialed up two inches (rear) it took the two inch spacer plus one of the 1/2 inch spacers included in the kit. The description should be updated because the kit does include 4-1/2 inch spacers but if you have bigger wheels or have upgraded the stock suspension then you will need to buy the extra spacers which come in 2/4/6 inch versions. The product can be used in two ways. 1) So the read end does not sag from tongue weight. If this is your goal you need the blue part spaced to just barely touch the frame. The other usage is as bump stops which can and you may wish to leave well away from the frame on a 4WD to allow wheel articulation. My goal was to eliminate rear sag when I load the motorcycle on the rack and it achieved that purpose (450 pounds).
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