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Improves suspension, handling and safety. Progressive spring rate. Provides additional support as needed so you always have a smooth, comfortable ride.
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Specs:
Average Customer Rating: 4.7 out of 5 stars (193 Customer Reviews)
Improves suspension, handling and safety. Progressive spring rate. Provides additional support as needed so you always have a smooth, comfortable ride.
Working great. Settled the bounce down and boosted the trailer capacity. It also gave me a piece of mind of what would happen if I broke another spring like I did before I bought these. Functional and added safety.
It is extremely hard for me to give this product a high rating because I was unable to install them. After making measurements before ordering them to be sure that they would fit, I purchased to sets for my tandem axle trailer. When they arrived, I determined the number of spacers needed, and in preparation for installation, bolted the springs to the Spring-Under Axle Bracket. I jacked up the trailer, set the first bracket with spring attached in place only to find that the long U-bolt would only project through the bracket approximately 1/8 of an inch, an inadequate distance to attach it with the washer and locknut. A trip to several local vendors failed to turn up a 5/16” U-bolt of the same width but longer. While the SumoSprings seemingly would improve the ride of my trailer, I had to return them due to this one component. I think the manufacturer should include different length U-bolts just as they supply different length bolts for use with the number of spacers needed.
I got 2 sets of these 5K-8k Sumo springs. I have Sumo springs on my tow vehicle and they are great. items states they fit any axle but would not fit my Dexter 8K axles. These are made for 1 3/4 inch springs and mine are 2 inch. called Super spring and they do not have a bracket for 2 inch springs. I was able to make them work by have a machine shop modify the brackets to fit 2 inch springs. they seem to be doing a good job on my trailer.
Sierra K.
9/21/2021
It sounds like you may need longer ubolts. The ubolts labeled “H” in the instructions.
We’re all of their trailer need you just need to contact the Trailer. They stand behind their word 100%.
As advertised Sumo springs dampen rough road ride a lot less side to side motion also
Pretty easy install on my tandem axel fifth wheel. I did have to add four additional 1" spacers, one for each spring, to get the additional 1/2" lift desired. To do this I had to buy longer M8X80 mm bolts. I haven't towed it yet but I expect them to perform as promised.
The single best upgrade for our toy hauler and the overall hauling experience. Buy these and install them asap!
Exactly as advertised, easy install, works great.
Very easy to install plan taking big trip in a few months can’t wait to see how they handle. Update to follow.
Sumo springs work great. I was a little skeptical if they would work since the Dexter 5100 lb axles on my trailer have two ribs going across them, I'm assuming for strength. The sumo spring bracket was just wide enough to sit on top of the rib center point. The bracket could be 1/2" wider, it would help. I tapped the bracket in and torqued it. As you can see it didn't go in all the way but seems to be ok. Took a road trip, highway, gravel and a rough forest road. Checked the torque after the trip and nothing moved. Sumo springs helped with the trailer sway and should take some load off the springs and shackles. I am pleased so far with this product.
If you own a camper, and you are planning on towing it on the crappy roads in America, you need these springs to cushion the ride and protect your investment. Install is fairly simple and straight forward. Just take your time and don't rush it.
Not really happy with the product. It just made the ride firmer and rougher. I should have gotten the add on shock kit instead. I'll be removing and selling the Sumo Springs.
Only 4 stars since I have only used them on one RV trip so far. I installed these in conjunction with an equalizer upgrade (Morryde SRE 4000) on my 2019 Grand Design Reflection TT. For the one trip I have been on, I liked how these helped cushion the ride of the trailer. I would certainly buy them again.
Easy to install. It definitely improves the ride by absorbing road vibrations and bumps. Also adds some left and right stability
2020 Cyclone 3 axle toy hauler. Can definitely tell a big difference in how quick the trailer settles down over large bumps like bridge transitions. Things inside seem to travel better.
My toy hauler when loaded maxes out the 2 8000# axels. These Sumo Springs stop the over travel of the suspension and stops the spring sag that these trailers are noted for. The ride is more under control and there is less effect on the contents.
We purchased these SumoSprings for our 2019 Heartland Fuel 250 knowing that they would not fit our leaf spring top plates, but I knew I could modify the mounting bracket to accommodate our RV. For anyone who has Dexter axles with shocks, you most likely have a 5-1/2” wide leaf spring top plate. If you are handy and have an acetylene torch or map gas you can simply heat and bend the inside bracket, drill a 1/2” hole and through bolt it to an existing hole in the top plate. I actually think this is a more secure install. Overall, it would be nice if there was an exact fit for our Rv, but it was an easy fix. Great product.
We have a Grand Design Reflection 5th wheel with the refridgerator on the rear wall, and we kept having issues with the fridge doors coming open during bumpy travel, so we installed the Sumo Springs based on a number of other reviews that indicated it would restrict the trailers bouncing. Total success, we have not had the doors open since the install, and generally feel less bouncing as we travel. The trailer also has less bounce when stationary, an added benefit.
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Rich
4/5/2024
They worked as advertised.