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When towing or hauling heavy gear, rear-end sag can mess with steering, braking, and headlight aim. These SumoSprings helper springs add up to 1,400 lbs of support at 50-percent compression to keep your ride level and steady. They help your factory suspension handle the added weight so you keep control and comfort even when the load gets serious.
Every road throws something different at you, and these springs adapt to it. The microcellular urethane compresses easily at first for a softer ride when lightly loaded, then firms up as the weight increases. That progressive load control keeps the truck comfortable when empty and stable when fully loaded, cutting down bounce and harsh jolts over rough pavement.

When a curve or side wind tries to push you around, each spring works on its own to keep that side planted. This independent action helps reduce body roll and sway so the vehicle feels more stable through corners or uneven ground. It also helps even out off-center loads so you can tow or haul with more confidence.
These springs are made from microcellular urethane that resists abrasion, oil, salt, and UV damage. They hold up in temperatures from -25 F to 200 F and compress vertically instead of sideways, so they won’t get damaged by nearby parts. With no air lines or pressure to monitor, they’re completely maintenance-free once installed.
Getting better suspension support shouldn’t require a shop visit. These custom-fit SumoSprings bolt on easily with no drilling required. Two jounce-style springs come in the kit ready to mount, giving you a quick way to level out your ride and keep it stable under load without extra hardware or adjustments.
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 SumoSprings rear-axle solo custom helper springs. Now, these have been designed to fit your 2008 to 2021 Toyota Land Cruiser and Lexus LX 570. And on custom-fit parts, such as these helper springs, I do recommend taking advantage of our "Vehicle Fit Guide" here at etrailer.com. Simply 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.
Now, as you know, towing or hauling a heavy load can cause your rear to sag as your factory suspension compresses under the weight of that load. And this means that your rear axle is trying to support not only the extra load, but also the weight of your vehicle. And because there is less weight on the front axle, your front tires may make less contact with the road, which is going to cause problems with traction, steering, braking. So these SumoSprings are going to help upgrade your vehicle's factory suspension to help level your vehicle, improving driving performance and keeping your ride more comfortable. These 1,400-pound-capacity helper springs are going to help provide progressive load support.
So the more that you load them, the stiffer they become. With the lighter load, the springs will compress easily for soft engagement and a less bumpy ride. The closed cell urethane material is going to allow for smooth contact between the springs and your vehicle. And the springs act like a shock absorber to dampen road vibration. Now, the springs can also compress by as much as 80% to support a rear heavy load and to help your factory suspension bear up under that load.
This means that it's going to even out the weight, which levels your vehicle and ensures that your front tires are making better contact with the road. So as you know, a level ride means that you have improved driving control. It's going to make sure that you have even safe headlight aim, it's gonna help minimize sway. And so these springs are going to help support your factory suspension, which is going to help prevent that sagging and reduce bottoming out. Now, these springs are gonna work independently from one another to support each side of your vehicle.
This action's gonna help reduce body roll when you make a sharp turn. This also helps compensate for off-center loads. These microcellular urethane springs are tough, they are going to resist abrasion, oil, salt and UV rays that can more quickly wear out other springs. And they're gonna perform well in temperatures ranging from negative 25 degrees all the way up to 200 degrees Fahrenheit. So SumoSprings compress vertically with minimum expansion to the sides. So what that means for you is they won't be damaged by nearby mechanical parts and they fit safely into tighter spots. And unlike air springs, these SumoSprings require no maintenance or adjustment. These jounce-style springs are made here in the USA and are custom designed for your vehicle. They're gonna install easily, no drilling required. As you can see, I do have them slightly, or loosely rather, put together. You're gonna get these two spacers, and then the two brackets that are going to fit your Land Cruiser or LX 570. I mentioned that the weight capacity is 1,400 pounds, so at 50% compression, 1,400 pounds, but SumoSprings do not actually increase your vehicle's weight carrying capacity, so you wanna make sure that you don't exceed your manufacturer's recommended weight limit. These do have a limited lifetime warranty from SumoSprings. And you will get an instruction sheet to guide you through the easy installation. Well, 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.
Ratings & Reviews

Lazer S.
5/13/2026
Glad to hear the install wasn't too bad, Michael! Definitely let us know how the ride is once you take it out for a drive! What are you using your Van for? The tires look pretty beefy.

Claire H.
9/1/2026
That is the beauty of SumoSprings! Super easy to install and once they're on you can forget they're there! Are you planning on towing something with your Jeep that you want extra support for?



Gwendolyn Y.
5/20/2026
Looks like you were about to head off somewhere fun, Chad!

Christopher H.
8/4/2026
Happy to hear the # SSR-118-54 was a simple install and is working well for you. This is a great system!

Gwendolyn Y.
4/23/2026
Thanks for the awesome feedback, Jeff! Love hearing that the install was a breeze and that you noticed such a big difference in handling, that’s exactly what you want after the upgrade. Really appreciate you sharing the photos too, it’s always fun to see the comparison.

Gwendolyn Y.
1/8/2026
Glad the Sumos are helping make your loads easier to tow!

Richard
2/12/2026
No issues. Towed a 27 Airstream around 4k miles & its all good.


Mike
7/31/2025
The springs are working exactly as expect. I have need up to the mountains numerous times and to Monerary to the Sea Otter bike fest. They have reduced the body roll and helped keep the truck stable on the mountain roads or when loaded down for camping. Im very pleased I added these Sumo Springs to my Tacoma.


Lazer S.
9/16/2025
Glad to hear they are helping, Cory! If you are feeling them going over speed bumps, I think taking one of the spacers out is a good idea. Especially if that is happening when you are unloaded. Speaking of which, what are you towing?



Albert
7/16/2025
Still working like new. So much better than the factory bump stop.

Andrew N.
10/21/2026
Hey John, thanks so much for the detailed response and photos. That really helps other folks on the page. I'm glad install went well and you're liking them! I have these sumosprings on my Nissan Titan and it's a huge upgrade for towing!

Kate F.
7/21/2026
One of my favorite things to recommend Kevin, the feedback is always so great on what a difference they make! What are you mainly towing that needed the extra support?

Mike B.
4/24/2025
Excellent, I also tow a 6x12 cargo trailer which the Sumos do a great job of maintaining a level ride. I also installed Sumos front and rear on my 32 Tiffin motorhome. It utilizes the Ford F53 chassis and I believe they compliment that chassis well. Im definitely a big Sumo fan.

Gwendolyn Y.
5/16/2025
I'm glad that the Sumos helped with the handling, David! And I think your pretty handy if you can get these installed :)

Claire H.
7/6/2026
That's the beauty of SumoSprings, easy to install and once they're on you can forget about them and let them do their job!
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Heather A.
8/12/2026
Wow thank you for the glowing review Randall. It sounds like once you got them installed they are working out great. That sunset is gorgeous, where were you in this photo?