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  1. Vehicle Suspension
  2. SuperSprings Intl
  3. Towing/Load Leveling
  4. Bump Stops
  5. Rear Axle Suspension Enhancement
  6. Light Duty
THIS ITEM IS NOT A FIT FOR
2015 Keystone Sprinter Fifth Wheel
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SuperSprings Intl

SumoSprings Solo Custom Helper Springs - Rear Axle

Part Number: SS42XR
In Stock
$238.99
Retail:$266.29
You Save: $27.30
Vehicle Suspension
Not Confirmed to Fit

2015 Keystone Sprinter Fifth Wheel

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etrailer Installation
We'll connect you with nearby partnered installers who know this exact setup.
1,400-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation. Great Prices for the best vehicle suspension from SuperSprings Intl. SumoSprings Solo Custom Helper Springs - Rear Axle part number SS42XR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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SuperSprings Intl Vehicle Suspension - SS42XR

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • 1,400-lb Load Support: Levels your ride when hauling or towing so steering and braking stay steady.
  • No Upkeep Needed: Closed-cell urethane design means no air lines or pressure to check.
  • Smoother Ride Over Bumps: Cushions shocks and vibrations for better control and comfort.
  • Handles Off-Center Loads: Each spring works independently to cut body roll in turns.
  • Durable for All Conditions: Resists oil, salt, and UV damage and works from -25 F to 200 F.
Made in USA

Features to know about

Stay Level and Confident: 1,400-lb Rear Suspension Support

When heavy loads or trailers push down the rear of your vehicle, it can throw off steering and braking. These SumoSprings Solo helper springs add up to 1,400 lbs of support at 50-percent compression to keep your ride level and steady. They absorb bumps and shocks while helping your factory suspension carry the weight, so your handling stays predictable and your headlights stay aimed where they should.

Smooth Ride When Empty, Solid Support When Loaded: Progressive Load Control

You don’t want a stiff ride when you’re running light, but you need firmness when the weight piles on. These helper springs use progressive load control — compressing easily at first for a softer ride, then stiffening as the load increases. They can compress by as much as 80 percent to support heavy cargo without bottoming out, keeping your factory suspension from wearing out under strain.

Comparison image showing SumoSprings Solo Custom Helper Springs installed on a vehicle rear axle, with one spring compressed under load and the other uncompressed to illustrate suspension performance and load support.

Stay Steady in Crosswinds and Turns: Independent Spring Action

When a curve or uneven load tries to shift weight to one side, each spring works on its own to keep that side planted. This independent action helps reduce body roll through turns and keeps off-center loads from making the vehicle lean or sway. The result is steadier handling and better control when you’re towing or carrying gear.

Tough and Maintenance-Free: Microcellular Urethane Construction

Forget about air lines or pressure checks — these one-piece urethane springs are completely maintenance-free. The microcellular material resists oils, road salts, and UV rays, performing reliably in temperatures from -25?°F to 200?°F. They compress vertically with minimal side expansion, so they fit snugly in tight spaces without rubbing nearby parts. Once installed with the no-drill mounts, they’re ready for years of smooth, stable hauling without adjustment or upkeep.

Specs

Weight and Capacity

  • Weight capacity (at 50-percent compression): 1,400 lbs

Warranty

  • Limited lifetime warranty
  • 30-Day satisfaction guarantee

SSR-407-40 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit for Trucks

Installation Details SS42XR Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:

Ratings & Reviews

4.7

2533 reviews
5 Stars
(2047)
4 Stars
(330)
3 Stars
(54)
2 Stars
(38)
1 Star
(64)
Review sort icon
1,400-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

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looks like good quality and easy install , haven't towed with it yet , seems like it should work well .



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Installed these on my Jeep Gladiator to help with pulling my camper trailer they have performed as expected



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Amazing! I love these things! They keep my truck from squatting loaded.

Odis profile picture

Odis

2/9/2025

Love it! Works great and no squat with a load!

Robin H. profile picture
Etrailer Expert

Robin H.

2/9/2025

@Odis glad to hear you love them and they're working so well!


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Very easy to install



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Great products and great company Etraioer gets it done!



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so far good product



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Easy to install works very with aload keeps truck level.



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Ordering was easy and Sheila was very helpful. The Sumo Spring was delivered quickly. I have not installed them yet well do when it warms up. I am sure they will do what I want them to do. I will do a follow up after I install them.



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Easy to install. Nice functionally upgrade. Happy with product. Let’s see how long will last.



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These spring helpers perform as they should. Install without lifting vehicle.



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My truck swatted really bad with the camper hooked to it but with the sumosprings it didn’t! Excellent product I highly recommend



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Keeps my gladiator from sagging when I tow, I do wish that I had got the stronger ones but I will repurchase when finances allow??

Lazer S. profile picture
Etrailer Expert

Lazer S.

10/14/2025

Glad to hear they are helping, Barron! I get wanting to step up to the heavier ones as well, but hold on to these when you are testing them out. Sometimes they can make your unloaded ride kind of harsh. What are you typically towing?

Barron profile picture

Barron

10/15/2025

I’m pulling a 22 ft ox connect trailer
Lazer S. profile picture
Etrailer Expert

Lazer S.

10/16/2025

@Barron Nice! Let me know if there is anything else I can help with!


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These worked as advertised. Thanks!



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Super simple install, exactly what I needed for my JT



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I Installed the SumoSprings in less than ten minutes and was on the road with my box trailer (overloaded as usual) The helper springs made a significant difference in the way the Gladiator handled.
I give them a 10.
And I Loved the prompt delivery!

Brooke M. profile picture
Etrailer Expert

Brooke M.

6/27/2025

Awesome, Tony! Whatcha hauling in that trailer that's overloading you all the time? :)



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I put them on my Jeep Gladiator Mojave which has a soft suspension. I have drove from Ohio to Florida with a camper attached and let me tell you, what a difference.!! The ride was so much cleaner.!! I could tell because I have made this drive twice without sumo springs and now once with them. I’ll tell everybody how well these work!



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Incredibly easy to install and they perform as claimed. I had a terrible experience with the blue air bags that were difficult to install and then failed. The Sumosprings don’t offer the adjustability but they make up for it with ease of install and effectiveness.



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Excellent! My son installed them in about 2 minutes on my 2025 Jeep Gladiator. He never even had to jack the truck up. Took off the old put on the new. Very impressed. Still need to test them with my Travel Trailer

Heather A. profile picture
Etrailer Expert

Heather A.

6/27/2025

Wow, does your son need a job as an installer!? 2 minutes has to be record time. It looks great Patrice! What kind of Travel Trailer do you have? Would love to hear how the springs perform when you take it out.

Patrice profile picture

Patrice

6/27/2025

@HeatherA . 25-foot Forest River Travel Trailer. Very heavy tongue weight. They worked great. No more sag in the rear. Definitely helped with sway . I have sway bars but chose to try without the sway bars to see how well they worked. A definite noticeable difference on the highway.b


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Easy to install and immediately noticed an improvement in ride stability and towing with my Gladiator. If only I had found these sooner.



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Put these on a Jeep Gladiator to haul a motorcycle to Sturgis. Kept everything level, good ride and stability. Highly recommend.



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This only pertains to the order, shipping speed, and install as I have not put a heavy load on these sumo Springs yet but I feel like that's a foregone conclusion based off the reviews already. The ordering process, the shipping, and the installation was unbelievably easy. I kept rereading the instructions thinking this can't be right because it was so simple. I looked at the YouTube video and realized it is that simple! So happy with the ordering process, the quality of the initial product I opened, and how simple it was to put on the jeep.

Claire H. profile picture
Etrailer Expert

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?

Justin profile picture

Justin

9/1/2026

@ClaireH yes Ms Claire. I plan to put a truck camper on the Jeep (that weighs in the 500-1000 lbs range). My payload is 1700 lbs so I know a camper of the weight will be significant my truck. Already ordered a stiffer rear anti-sway bar as well.
Claire H. profile picture
Etrailer Expert

Claire H.

9/2/2026

@Justin That sounds like a good plan! These SumoSprings plus the sway bar should be more than enough to handle the weight of your truck bed camper.

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See what our Experts say about this SuperSprings Intl Vehicle Suspension

  • Recommended Helper Springs For A 2020 Jeep Gladiator With A 2 Inch Lift
    When it comes to installing helper springs on your 2020 Jeep Gladiator with a 2 inch lift I recommend The Timbren Rear Suspension Enhancement System # T76FR. This system has a 3,000 pound capacity and sit above the rear axle to help stabilize and level your Jeep Gladiator. You will also get a better ride because they absorb road shock and improve roll stability. They're easy to install and use. The spring work independently - side-to-side, and help compensate for off-center loads. Make...
    view full answer...
  • Sumo Springs Helper Springs For 2023 Jeep Gladiator Mojave
    Hello Carl, thanks for reaching out. We do offer sumo springs that will fit your 2023 Jeep Gladiator Mojave. For that I recommend the SumoSprings Solo Custom Helper Springs # SS42XR. These are the 1,400 lb capacity rear springs which will help to add stability and shock absorption when you are towing. Then the sumo springs are soft enough it won't make the factory ride too rough when not under a load. The Timbrens can work well when loaded, but they can make the ride pretty rough when...
    view full answer...
  • Does Air Lift Make Heavier Air Bags for 2020 Jeep Gladiator
    Hi Jonathan; that doesn't sound right, do you have a picture you can send? I'm sorry to say that Air Lift does not make a heavier air bag for your 2020 Jeep Gladiator. The # AL60830 is the only option. If you really want to stick with air bags you could try the Firestone # F29ZR. Have you considered SumoSprings Solo Custom Helper Springs # SS42XR? These have a very simple, straightforward installation. They also don't require any maintenance once installed. With a capacity of 1,400 lbs...
    view full answer...
  • Recommended SumoSpring Jounce Springs For A 2021 Jeep Gladiator Rubicon
    Hey Erwin, I always recommend matching the enhancement to the weight you plan on towing while also factoring in your vehicle's payload capacity to avoid affecting your unloaded ride quality. With the payload capacity of your Gladiator being only 1,200lbs and the camper weighing in at 1,000lbs the SumoSprings Solo Custom Helper Springs # SS42XR (1,400lb capacity) would be more than enough to help support your suspension with the camper loaded in without being so stiff that it becomes uncomfortable....
    view full answer...
  • Recommended Suspension Enhancement To Prevent Sag On A 2023 Jeep Gladiator
    For your 2023 Jeep Gladiator we recommend the SumoSprings Solo Custom Helper Springs # SS42XR. These are 1,400 lb capacity urethane springs. I prefer these over other options for a few reasons. Firstly because they will be a very easy bolt-on install. I also like the Sumo Springs because they feature Progressive load control. Meaning the spring becomes more firm as more weight is applied. So it will help keep your ride level and absorb shock when you are towing, and it will also allow you...
    view full answer...
  • What is Height of Blue and Black SumoSprings Kits that Fit 2021 Jeep Gladiator
    Hey Dennis, both the blue SumoSpring kit part # SS42XR and the black part # SS62XR are 5-1/2 inches tall.
    view full answer...
  • Suspension Enhancement Recommendation for 2021 Jeep Gladiator Towing Trailer
    I would go with the SumoSprings kit part # SS42XR for your 2021 Jeep Gladiator Mojave for suspension support. Air bags can work great but they are a lot more maintenance and the support they provide is very easily pretty harsh. The SumoSprings kit is something that once you install it you don't have to think about it again and it will provide the support you are looking for for all of your trailers.
    view full answer...
  • Recommended SumoSprings for a 2020 Jeep Gladiator
    For your 2020 Jeep Gladiator, I recommend the Blue SumoSprings Solo Custom Helper Springs item # SS42XR. These have a 1,400 lbs capacity and only engage when weight is placed on the rear suspension. These springs use a system called progressive load control. The more weight you place on them the more they engage. This provides you with only the support you need when you need it. Unlike other systems like Timbren's which negatively affect your ride quality whether or not you have a heavy...
    view full answer...
  • SumoSprings Solo Custom Helper Springs for 2022 Jeep Gladiator
    I would be happy to help you and I have a great set of helper springs for your 2022 Jeep Gladiator. I recommend the SumoSprings Solo Custom Helper Springs item # SS42XR. These SumoSprings have a 1,400 lbs capacity. They will keep your vehicle level when you're towing or hauling a heavy load, help to absorb bumps and shocks, and minimize sway. The springs work independently from each other to compensate for off-center loads and reduce body roll during sharp turns.
    view full answer...

Do you have a question about this Vehicle Suspension?


Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video Edited:
Joshua S
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Jonathan Y
Video Edited:
Jonathan Y
Employee Wilson B
Updated by:
Wilson B
Employee Alex H
Written by:
Alex H
Employee Michael B
Installed by:
Michael B
Employee Jacob H
Installed by:
Jacob H
Employee Thomas T
Video by:
Thomas T
Employee Matthew B
Test Fit:
Matthew B

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