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Heavy loads can make the rear end of your truck droop and throw off how it handles. These Coil SumoSprings Custom Helper Springs fit between the coils on your rear suspension to add extra support. The microcellular polyurethane foam stiffens as weight increases, helping your suspension stay level and keeping steering and braking steady when towing or hauling. They help reduce the body roll that makes your truck feel loose under load, so you stay in control even with gear or a trailer behind you.
When your suspension bottoms out, you feel every bump. Each Coil SumoSpring has a microcellular polyurethane inner core that cushions the ride and absorbs shock before it reaches the cabin. The springs get stiffer as weight increases, so the more you load onto your vehicle, the more support they provide. Whether it’s a full bed of cargo or a trailer on the hitch, you get smoother travel without the harsh rebound of worn coils.
Forget about checking air pressure or chasing leaks. Unlike systems that rely on air bags, these helper springs are solid polyurethane and need no upkeep once installed. There are no airlines, tanks, or valves to mount—just insert them between your existing coils and go. The material is tough enough to handle extreme temperatures and resist abrasion, oil, road salt, and UV rays for long-term reliability.
You don’t need a lift or special tools to get these working. The springs insert between the individual loops of each rear coil spring and stay in place with H-shaped channels molded into their top and bottom edges. They’re designed to install easily on a suspension that’s already in good shape, giving you extra load handling without complex setup or adjustments. Once in place, they’re ready to work every time you hitch up or haul a load.

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi there Heavy Haulers! Today we will be taking a look at SUPERSPRINGS's line of Coil Sumo Springs. Now, before we install our Sumo Springs on our vehicle here, we want to make sure and see how our stock suspension rides. So we can get a good comparison of the improvements that we've made with the Sumo Springs. So the first thing we want to see is our factory ride height with it, unloaded. Then we're going to see, when it is loaded. And then we'll perform the same tests on our test course with it loaded up, without the Sumo Springs, and then we'll do it again after we've got them installed to see how they compare.
So first off, we need to see our ride height. We're currently unloaded. And here at the back, we're sitting right at about 33 inches. And today we're going to be putting these on a Subaru Ascent. And here at the front of the vehicle, we're right at about 32 and three quarters of an inch.
So we'll go ahead and load it down now, and see how our ride height changes. So we've gone ahead and loaded it up with a couple hundred pounds of sand, and we're going to recheck our ride height. And now with it loaded up, our ride height here in the back's dropped down about a half an inch. So we're at 32 and a half inches. And here in the front, it's raised our suspension up by about a quarter inch.
So we're right at about 33 inches here. So we're going to go ahead and get those Sumo Springs installed now. And we'll recheck our ride height. We're also going to hit to test course before we get those on. So let's get that to test course and then get in the garage.
So here we are in our vehicle now. We're in our test course. And what I did notice, just lining it up in the test course versus loaded and unloaded, is that we've got a bit of, the hood's raised up a little bit. We see more hood than we used to, so we lost a little bit of visibility there. We're going to start with the uneven bumps section. This is going to simulate like hitting a pothole. And as we hit these here, the suspension in this vehicle is very smooth. So we don't really have a lot of rocking and stuff like that going on. In the biggest thing so far I noticed is that we can see more hood. You can definitely feel that we're leaning back. Next we're going to go into the even bump section, and this is going to simulate a speed bump or like pulling in and out of your driveway. And here, when we go over it, our suspension again, does seem to be taking it pretty well. We don't have a bunch of up and down motion. It's not excessively stiff. So it does feel fairly well. So let's go ahead and get to our slalom section now. And this is where we're going to mimic an evasive maneuver. We're in our section now, so we're going to start giving it a little bit of that. And I mean, it handles fantastic. The suspension on this car is really good. You can hear the things moving around a little bit, but it's, it doesn't feel like we've got excessive sway or anything like that. So this vehicle does have a pretty solid suspension system. So we're going to head back to the shop now. We're going to get these Sumo Springs installed and we'll hit the test course and see how it differs. I feel like this is mainly going to be for people that maybe have like a pop-up camper or something that they're wanting to bring on the back. And they've got maybe like 300 or 400 pounds or even greater in the back there. So we are here in the shop and see what happens. So we've got our Sumo Springs installed now. We've got our vehicle loaded up the same weight that we had before. Let's recheck our ride height. And we're right at about 32 and a half inches. So it didn't really raise our vehicle up any, having these installed. And now here in the front, when we check our suspension, we're right at about 32 and a half inches. So it has lowered our vehicle down about a half inch from where we were, when we we're fully loaded up. So what it seems like is that the suspension enhancement in the back, rather than lifting up on the back of our suspension to kind of, raise it back upto where it was unloaded, it just kind of repositioned it a little bit. So we're still down a little bit in the back, but we we're also down in the front now more level, kind of closer to where we we're before. So let's hit the test course and see if we can feel a difference. All right, so we're hitting the test course once again with our Sumo Springs installed. And I do notice right away that the sitting in the vehicle, the hood's a little bit back down. It feels more like we're sitting in it unloaded since we're not seeing quite as much as the hood. So we're gonna hit that uneven bumps section first here, and it feels a little bit stiffer in the back. It doesn't really feel too much different. It feels pretty natural here on the inside. I would say it is definitely a little bit stiffer. As we hit these front bumps here, I can tell its a little bit softer on the factory suspension versus the back. The Sumo spring is just a little bit stiffer than where we we're before. But I wouldn't say it's at all uncomfortable. It feels for the most part, fairly natural. Same thing when we hit the even bumps. Really nothing stood out there, just a little bit stiffer. So now we're gonna go ahead and hit the slalom section and see if we can see a difference here. And this is usually where I noticed a huge difference, but the suspension on this is already pretty darn good. So we'll see if we notice much of a difference. And there's nothing really right away, that stands out at me. It does feel like there's a little bit less way and roll than before, but there's not a huge difference here either. This Subaru does have some pretty darn good suspension. I'd say the biggest notice out of anything. is just the way the vehicles more level, when riding now, I'm not seeing quite as much hood. I know it's going to make a huge difference at night. During the daytime here, it makes a little bit of difference because we've got a little better visibility at the front. But at night when you have the front end aiming up, your headlights are pointed towards the sky a little bit, you're not really getting proper reflection on the road and it does drastically reduce your visibility at night. And this is what our Super Springs look like when they're installed. These go in between the coils of your suspension system. And there are rear and front's available here at etrailer. We're showing off the rear set today. These are designed to fit a whole bunch of different vehicles and can be trimmed to fit. So that way you can ensure that it's going to be a proper fit for years. But as always, I recommend that you use our fit guide to ensure that these are going to be a proper fit for your particular vehicle. The main purpose of Sumo Springs is to provide additional suspension support for your factory suspension system. Now, the support that it provides, doesn't increase the load carrying capacity of your vehicle. It just provides assistance to help support the weight that your vehicle can already carry and just carry that weight better, so your suspension isn't sagged down so much here in the back. It's going to overall improve your ride quality when loaded down and just give you a little bit better handle on your vehicle when you're hauling a bunch of weight. This works using the Sumo Spring technology here. It's made of a micro cellular polyurethane that is compressible, but it's got a neat property to it. It's actually quite dynamic in its compressibility properties because when we're at our normal resting state, like we are now, we've got our suspension hanging. We're really not getting any support from our spring right now. But as we go to load this down and it goes to squish the spring, it starts off squishing really easily. And then it gets progressively stiffer as you squish it more. And that's going to make it nice and dynamic. So the more you load down your vehicle, the more support and stiffness you're going to get out of this spring to help carry that weight. So it really does help out a lot with roll, helps out with your ride height. Really overall, these are a great option for just restoring a loaded down vehicle's performance back to where it would be when it wasn't loaded up so heavily. I like these over air bags because they're completely maintenance free. With air bags, you have to check the air pressure. When you go from between different seasons, like summer to fall to winter. As temperatures go down, pressures go down and you got to keep up checking these to make sure that it has proper air in it. Whenever you load your vehicle down, you need to adjust the air pressure to match your load as well, which just can be kind of bothersome. With these, you just load it up and they're dynamic and progressive the way they work. So you just load it up, you just forget about it and drive off. With air bags you might have five, six pounds in it. when you're unloaded, you get to the place where you're picking something up. Maybe you're picking up a load of bricks or something, to bring back and build a little fire pit. Well, now you get your vehicles all loaded up, you got all this weight in the back, that five pounds on your airbags, isn't really doing a lot for you. So you're going to have to stop at a filling station and put some air in it, or spend a lot of money on an onboard compressor system and be able to do that on demand. So airbags, they do have their place, but I really like these for just kind of your, more general purpose applications. If you're going to be looking at something really heavy duty, those airbags might be a good consideration, because you can get more stiffness out of them, you got more adjustability in the pressure. But for the average user, I think these are going to be probably one of the best setups. We'll begin our installation underneath the vehicle. The first thing you'll want to do is lift the back of your vehicle up. So that way, your suspension is hanging. I would recommend if you're doing this at home in your driveway, just do it one side at a time. That way you can lift just this back tire up, so it's off the ground. That'll give you more distance between your coil spring, making it easier to install our suspension enhancement system here. So once you've got your side lifted up, we're using a lift here. So we've got ours up, differently. Make sure you chuck your wheels as well, if you're doing this at home on the ground. We're going to clean our coil spring off first. You can see it's kind of got some dirt and debris on it there. So we're going to get all that out of there just to make it slide in a little easier. We're just using some soapy water and just a rag here just to clean these off. We're just going to wipe down all these coils just to get that dirt and debris off of there. All that dirt really makes it a lot harder to slide your suspension enhancement system in place. Nice clean, smooth coils will make things a whole lot easier. So we're just going to give those a good wipe down here real quick. And now that we've got them wiped down, we're going to reapply the soap to our coil spring. And I'm also going to apply the soap to the Sumo Springs. And now we're ready to insert it. And first you're going to identify, which is the top side, and this can be done by checking the grooves. So this group here, you can see how deep it is. You see a little bit of my fingernail sticking out the top there. If we flip it over to the other side, I stick my finger in, you can't see my fingernail at all. The deeper groove is your bottom. So now that we know the correct orientation we're just going to take our spring here, and we're just going to start feeding it into place. I'm going to take one section here and I'm just pushing it in between the two coil Springs. And that's really all that there is to this, is just pushing it into place. I'm getting one side started, and after I get it started, I'm just going to kind of work the coil spring around, into place. And it's just kind of rotating around. There we go. We got to all fall into position. After this, we'll need to just set the adjustment for the height and it's best to install these between the second and third coil from the top. So we're just kind of rotating ours to about that position there. That looks pretty close. So that's good. The next thing we'll want to check, is our overlap. So here you can see the overlap at the back, where our lower spring here sitting underneath the top part of that suspension enhancement system. We want our overlap here to be between about a half an inch and an inch. And we're sitting at close to a, probably two, maybe two and a half to three inches. So we'll trim this down. You can use really whatever you've got available to trim it. Probably a little bit of a saw or something would probably work well. It's pretty thick, so you might be able to use some cutters to cut it, but it is pretty thick. The hardest part is, it spreads. Now we're not going to be trimming ours today for demonstration purposes. We're just going to, deal with the overlap that it's got there. But also did want to point out the holes that you see there at the back as well. You see those little dimples that are located there and you have one of them, a dimple on the top one as well. That will allow you to slide a zip tie through. So you can zip tie these to your coils because on some vehicles, they might be a little bit loose and sloppy, and this is probably a good candidate for it because it is fairly loose inside this coil. And if it's got a lot of play like that, and it's not a real tight fit, it is possible that it could pop out of there when going down the road. So it's why it's got those little holes there. You can run a zip tie to zip tie it right to the coil spring. So that way there's no way it can come out of there when you're traveling down the road, make sure it stays in place. So now we have our passenger side fully installed. We're going to repeat the same process over here on the driver's side to get this one installed as well. And that completes our look at SUPERSPRINGS's line of Coiled Sumo Springs..
Ratings & Reviews
I had for a week now and so far so good. Ride without any load is a little stiff similar feeling to car with sport suspension and with a low profile tire. A little less comfortable but not that bad. With a heavy load that's when this comes to work. The height is almost same as without the load and the right is really good. The installation of this is very easy. The only thing is the groove is a little bit too wide for the spring.
Fast shipping!!!!
So far so good installed to mitigate droop while loaded...well see but installation was straightforward and so far goal has been met
The instructions, well!! lack a bit of detail. My first instinct was to return them . I called the manufactures tech line ,and got the 10-36 asap.
........ after that the install was a breeze !!
I am in the opinion these helper springs will stiffen the rear coil enough to balance a heavier tongue or small trailer weight.
Very impressed with the SumoSprings. Was hesitant at first, but purchased a set for my 2017 Hyundai Santa Fe limited ultimate that had a squishy feeling ride and looked like it sat a bit lower in the back. Installed these on the rear springs and raised the ride height 1" in the rear and the ride is much better already. I'll have to see how they do with a loaded down vehicle but without the SumoSprings, 2 adult rear passengers and 2 dogs in the very back, suspension bottomed out over decent bumps and was not a good experience at all!
5 minute install with no tools beyond a jack and a bottle of dish soap. Ride remains unchanged when not towing. Big help with sag when pulling a 27' cuddy cabin ( just under 9000lbs) with my '21 Expedition Max FX4
They have not affected the ride as I can tell, ho0wever, I have not towed my trailer as yet. we will see. They were super simple to install. No soap needed.
Install was simple. On daily day to day drive it made the rear a little more firm but in most cases you won’t notice it. The rear when loaded didn’t droop as much as it did before and the ride felt more compose. Instructions were a little vague or universal but it gets the job done. Overall it did just fine. The value for what it is and what you get or don’t get from it was the biggest issue. For 200 plus dollars there are a lot more options out there that gives more adjustability and option. For some foam/rubber like materials and only for the rear, it’s on the steep side. Hopefully in the future this can be addressed and it would be worth the 5 star.
Great product, easy install. Solved the trailer squatting problem
Pretty easy install, except for the indignity of lying on the ground to prove your fealty to the automobile. Soap def helped. Will see after my 2k adventure if it helps.
Installed the CSS-1168R Coil SumoSprings Custom Helper spacers on a 2011 Honda Ridgeline 4 wheel drive rear springs. Installation took about 45 minutes including removal of tires. Once spacer was started the installation was easy.
Zip ties were a little more difficult because of the dust strut covers installed by Honda.
Worked very well. Easy to still after I figured out installation.
I could not place the SumoSprings in the middle of the coil springs to start installation. Rather I had to start lower on the coil springs, where the spacing is wider, and then slide the SumoSprings up to the middle.
I used a screwdriver run into the holes for that purpose to help slide the SumoSprings to the middle of the coil springs. Otherwise, the installation went well. There seems to be less squat in the rear of my '04 Highlander when my camping trailer is attached.
I installed a set of 1125 Sumo Springs in the rear coils of my Toyota RAV4 Limited Hybrid AWD to increase the spring rate ahead of a cross-country road trip. My RAV4 really sags with a rearward rake when passengers + rear cargo are loaded in the vehicle. This impacts the handling of the vehicle and throws off the aim of my headlights, which leads to other drivers flashing their high beams at me as my headlamps are shining in their eyes. Hopefully these Sumo Springs solve that problem. I’ve driven about 50 miles post install and can tell the ride is much more firm and stiffened up in the rear of the vehicle. The RAV4 feels much more sporty and planted.
The install was much more difficult compared to my Sienna. In our van, the Sumo Springs slid right into place - it was a 10 minute job and I didn’t need to remove the wheels. On the RAV4, this was not the case. I had to remove the rear wheels to gain enough space to work the Sumo Springs into position between the coils. The fit was also much more tight; I had to really jam the Sumos into place and slide them into the center of the coil (it was a real arm workout). The Sumo Springs also overlapped about 2”, so I removed and trimmed each down with a razor knife to achieve a ~.5” overlap (per the supplied instructions). Install time was about 90 minutes as I had to remove the Sumos and trim them - which doubled my labor time.
Time will tell to see if these work, but I’ve had a set of Sumos in my Sienna for about 15k miles / 1-year and they have done just fine, so I suspect these will too.
Put them on today. Pretty easy. Got 1/2" lift too. Gonna hookup my teardrop tomorrow to test them. See if it squats as much. Probably not. These are sooo expensive, but nothing compares.
These Sumo springs helped my 2015 CRV not sag in the rear. I carry parts and tools in the back constantly and now it rides as it should.
Sumo Springs helped a lot with rear sag on the Highlander when hauling heavy trailer loads. No negative effect on front end handling. So far.. so good! Will see how pulling at 7x14x14 tandem axel trailer will do next.
I recently installed these along with new Monroe struts on my 2010 Toyota Highlander. What a game changer. We tow a Rockwood Freedom 1910. While the Highlander has plenty of power and decent towing capacity, I was unhappy about how the vehicle rode and sagged when towing the camper. Those days are long gone. The Sumo Spring raised the ride height about an inch overall and it doesn’t sag much at all when towing. The ride is a little stiffer but the Highlander handles so much better. No body roll when cornering and not a lot of forward pitch under braking. These Sumo Springs Sumo Springs are worth every penny.
As mentioned in previous reviews, these SumoSprings Helper Springs resolved the known 2025 Toyota Highlander Hybrid sag issue when there is any weight on the hitch or in the back of the vehicle. It completely eliminated it on my 2025 Highlander. Installation was extremely easy (less than 10 minutes) after watching the Etrailer and SumoSprings installation videos (you really only need to watch one of them as they are almost identical). I highly recommend these SumoSprings Helper Springs if you have any issue with sagging on your Highlander.
Took about an hour to install because I had normal jack and wanted to take tire off for easier access to spring. Once I had the tire off it literally took 1 minute to feed the support on. I did use warm soapy water as one video suggested. Looks like it raised the rear about an inch and looking forward to less sag in the ride with 20 ft travel trailer attached.
Another great experience with eTrailer!
Had a quick question and Kaleiya T. regarding the provided part number and Sumo Springs fitment on our 24' Toyota Sienna XSE. She called me back within minutes - sourcing and clarifying the answer. Love these personal interactions and NO A.I. at eTrailer that really spoils the customer service experience. eTrailer absolutely sets the bar
consistently high each and every time! The install video(s) from eTrailer on YouTube made installation seamless, especially the tips like soap/water (for both cleaning the surfaces and transitioning the bushing onto the factory suspension coil spring!
I installed a hitch on my Subaru Outback. These were a great addition. It added an additional 2" lift. You need to follow the directions exactly. When it says to use soap to help squeeze it in between the coils use it liberally. It takes strong hands, but once you start it's easy to wrap into the coil of the rear suspension. Great product.
2026 Subaru Outback Touring XT. The Sumo Springs installation was completed without issue. They effectively mitigate the trailer's 200 lbs. tongue weight, resulting in less than 1 inch of suspension sag. No adverse effects on handling or ride comfort have been observed. The only installation discrepancy noted involved the overlap. While most instructional videos demonstrate zero overlap, I confirmed with the manufacturer, SuperSprings, that up to 1 inch of overlap is acceptable. They ultimately advised that the units can be trimmed to preference for a customized fit and gave no definitive answer. I personally set my overlap to 1/2".
I'm not sure if this picture does it justice, but the before pictire with the boat covered, there is noticeable sag in the rear. Dealt woth that for a year. Installed the coil sumosprings helper yesterday and she's level now.
Tip, when installing on an older vehicle with rusted springs, take some extra time to sand the springs until the feel smooth. Do that and the dish soap and they go on pretty easy.
Just installed it was so easy. Perfect fit for my Jeep Renegade Trailhawk and my rear tires now stand striaght perpindicular instead of bowed inward. Bought to support the extra weight of camping trips.
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