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2017 Mini Cooper
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SumoSprings Solo Custom Helper Springs - Rear Axle
Part Number: SSR-313-54
In Stock
$341.99
2017 Mini Cooper
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- Reviews (2544)
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SuperSprings Intl Vehicle Suspension - SSR-313-54
Highlights
- Custom Fit for Your Vehicle: Mounts to existing attachment points
- 2,800-lb Load Support: Keeps your rear end level under heavy loads for steadier, safer towing.
- No Upkeep Needed: Solid urethane design means no air lines or pressure checks to maintain.
- Smoother Ride Over Bumps: Cushions shocks and road vibration so driving feels more controlled.
- Less Body Roll in Turns: Each spring works independently to stabilize sway and off-center loads.
- Built to Last: High-density urethane resists oil, salt, and UV damage from -25°F to 200°F.
Features to know about
Stay Level and Confident Under Load: 2,800-lb Rear Suspension Support
Heavy loads tend to drag the rear end down, throwing off handling and braking. These SumoSprings Solo helper springs add up to 2,800 lbs of rear support at 50-percent compression to keep your ride level and steady. They help your factory suspension carry the extra weight evenly so the front tires stay planted for better steering and traction when towing or hauling.
Smooth Out Bumps and Rough Roads: Progressive Load Control
Normal suspension can bottom out or bounce when loaded. The microcellular urethane in these springs compresses progressively—soft at first for lighter loads, then firmer as weight increases. That means a smoother, less bumpy ride when lightly loaded and solid support when you’re carrying more. Each bump is cushioned so your vehicle stays comfortable while still feeling planted on rough pavement.
Stay Steady in Crosswinds and Turns: Independent Spring Action
When uneven loads or curves push your vehicle off balance, these springs work independently on each side to keep things level. They cut down on body roll in turns, help control sway, and handle off-center loads without affecting the other side. The result is a more stable feel through corners and when crosswinds hit.
Keep It Simple and Reliable: Maintenance-Free Urethane Design
Air systems need lines, fittings, and pressure checks. These helper springs don’t. The high-density microcellular urethane resists oil, salt, and UV damage, works from -25 F to 200 F, and compresses vertically to avoid rubbing nearby parts. With no air lines or pressure to monitor, they’re a set-and-forget solution that installs easily with no drilling required.
Specs
Weight and Capacity
- Weight capacity (at 50-percent compression): 2,800 lbs
Warranty
- Limited lifetime warranty
- 30-Day satisfaction guarantee
SSR-313-54 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit for Vans
Replaces SSR-308-54
This Product Fits The Following Vehicles
- 2017 - 2019 Hymer Aktiv 2.0 Motorhome Base
- 2019 - 2019 Hymer Aktiv 2.0 Motorhome Loft Edition
- 2017 - 2019 Hymer Aktiv Motorhome Base
- 2018 - 2019 Carado Axion Motorhome Base
- 2018 - 2019 Carado Banff Motorhome Base
- 2021 - 2022 Roadtrek Chase Motorhome Base
- 2023 - 2023 Thor Dazzle Motorhome 2AB
- 2023 - 2023 Thor Dazzle Motorhome 2JB
- 2023 - 2023 Thor Dazzle Motorhome 2LB
- 2023 - 2023 Entegra Coach Ethos Li Motorhome 20AL
- 2023 - 2023 Entegra Coach Ethos Li Motorhome 20DL
- 2023 - 2023 Entegra Coach Ethos Li Motorhome 20TL
- 2021 - 2023 Entegra Coach Ethos Motorhome 20A
- 2023 - 2023 Entegra Coach Ethos Motorhome 20D
- 2021 - 2023 Entegra Coach Ethos Motorhome 20T
- 2018 - 2018 Fleetwood Irok Motorhome Cruiser F3
- 2018 - 2018 Fleetwood Irok Motorhome Cruiser F4
- 2018 - 2020 Fleetwood Irok Motorhome FSD
- 2018 - 2020 Fleetwood Irok Motorhome FSL
- 2018 - 2021 Pleasure-Way Lexor Motorhome FL
- 2017 - 2021 Pleasure-Way Lexor Motorhome TS
- 2021 - 2023 Coachmen Nova Motorhome 20C
- 2020 - 2023 Coachmen Nova Motorhome 20RB
- 2015 - 2015 Coachmen Orion Motorhome 24RB
- 2016 - 2016 Coachmen Orion Motorhome 24RB - ProMaster
- 2021 - 2022 Roadtrek Play Motorhome Base
- 2022 - 2022 Roadtrek Play Slumber Motorhome Base
- 2022 - 2022 Roadtrek Play SRT Motorhome Base
- 2014 - 2028 Ram ProMaster 1500
- 2014 - 2028 Ram ProMaster 2500 See All Vehicle Fits
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
- Wrong item was ordered
- Did not arrive in time
- Too difficult to install
Ratings & Reviews
4.7
2544 reviews
by:
Michael
05/09/2026
2025 Promaster 2500 159” wheelbase. Backed the van on couple 2” X 6 “ easier sliding under. Sprayed PB Blaster on top of bumper spring, using a 16” Channel Lock, easy off with the old. At that time I jacked the rear end to allow clearance. One side at a time. Took longer for set up then the job. I used the long bolt with two spacers. Have not drove yet, though looking for great results.
by:
lscottparker
09/11/2026
Ram
ProMaster 2500
Easy installation and big improvement to ride quality and handling. A must have for any Promaster camper van.
by:
Kenneth
04/21/2022
I am happy doing bussines with Etrailer, I ordered the wrong Super springs for my Ram Promaster 2500 by mistake, called them up spoke to miss Paula and she was able to find and ship the correct one fot my Vehicle within a couple of days. She even send me a Return lable so I can return the other one back to the company. I look forward to continue doing bussines with this company.
by:
Brett
11/11/2022
I wish I installed these earlier on my Ram Promaster converted into a camper van, the improvement in stability, feel and peace of mind. No longer blown around in high wind, better towing for my boat, firmer feel just driving normal. Hard to describe all the benefits but for how reasonable they are priced and ease of installation certainly wish I had these day one when I bought the van. 100% will install these again on future vehicles and would definitely recommend this to any and everyone
by:
Ruben
07/22/2021
2021
Ram
ProMaster 3500
Pretty easy install on a Winnebago Solis, built on the Ram Promaster 3500 chassis, took about an hour to install on all 4 wheels. I only parked on a level surface and used the factory jack, didn’t even lift the van off the ground all the way but enough for clearance to install, no tire removal done. I gained about an inch of clearance which is nice for my onboard generator and hoping for a better ride on windy days. The pictures are before and after of (in order) front, rear, size difference of Sumo vs. oem and the generator.
by:
Bryan
07/27/2026
Buy them. Install them. You won't regret it. Amazing change in ride.
by:
Keith M
12/20/2020
2016
Dodge
Ram Pickup
The Sumosprings solved the bad wind swaying problem in my 2016 Roadtrek Simplicity RV built on a Ram Promaster 3500 high roof chassis. Before it was white knuckle driving, now it drives like a sedan. My local RV dealer installed them for a one hour labor charge. The improvement is amazing! Right before going bankrupt, Roadtrek began putting SumoSprings on their special "National Parks" vehicle - they are a necessary addition!
Keith M.
12/22/2021
still handles very well. A very necessary upgrade!
by:
Anderson
03/21/2026
Game changer
by:
Jim
12/12/2019
2019
Dodge
Ram Pickup
Very prompt delivery and great “in-route” communication. Installed on a 2019 RAM ProMaster 3500 (configured as a Winnebago Travato). Easy,easy install. Used to replace the factory bump stops. Installed using the extra provided spacer and as many have said, raised the rear height by one inch, and provided the added stability to limit sway and improved straight line stability. So far a great product and great purchase experience.
Jim
12/13/2020
Still going strong after 12 months and 10,000 miles. Ive since installed the front spring helpers and been very pleased with the overall improved handling of the van. I highly recommend doing at least the rear bump stops.
by:
Sam
05/20/2019
2017
Dodge
Ram Pickup
Put these and the front Sumos on our 2017 Winnebago Trend (Ram Promaster 3500 chassis). These were very easy to install; the front ones took more elbow grease and patience. They make a big difference in handling, especially when big rigs pass on the freeway. Very satisfied so far.
Steve M.
5/21/2020
Still happy after a year, although not happy about not being able to get out on the road due to CV-19.
by:
Evan
11/13/2021
Dodge
Ram Pickup
These things are awesome. Perfectly manufactured, fit perfectly and installed very easily. I needed the extra 1/2” or so of ride height to prevent bottoming out when backing up my steep driveway on my RAM Promaster 3500.
Evan
11/15/2022
These springs continue to be working perfectly after 1 year and 10,000 miles. The ride continues to have much less side-to-side sway in turns and against opposing trailer truck traffic! But remember to buy and install the front springs too for the best ride comfort.
by:
Chris
08/06/2025
Suzuki
Swift
2024 Jayco Swift.
This should be done by factory. Felt unsafe without them. Very easy install and definitely would buy again.
This should be done by factory. Felt unsafe without them. Very easy install and definitely would buy again.
by:
Frank
04/24/2024
So I am an expert because I watch YouTube and I went to coledge. If you want crap then go to that jungle site that specializes in "cheap-n-fast" but if you want some great s%&t then go with eeeeeeetrailerdotcom. You know I know because not only can I computer but I cann spel. I have used et.com to set up my Promaster to tow my boat, to set up my RAM 1500 to tow heavy stuff and setting up my Nissan Frontier to tow my camper. Don't be a dumb-head-poop-4-brains, watch their videos and you too can be as amazingly smart as myself!
by:
James
05/29/2020
The product speaks for itself, very high quality at a very fair price. The big deal here is e-trailer. This has been my "go-to" place to shop since we started RV'ing 15 years ago. They are terrific to work with and if they don't have what your looking for it's most likely because that item just hasn't been invented yet. I will continue to shop at e-trailer.
by:
Randi
12/07/2018
2015
Winnebago
Trend Motorhome
Received product quickly and spent 1 hour putting the sumo springs on.
Very pleased with product.
Very pleased with product.
by:
Kim
12/17/2021
PRICING BEATS MY MAIN DISTRIBUTOR, BY FAR! I ALWAYS GO TO ETRAILER TO ORDER SUMO SPRINGS.
by:
Louis
06/24/2018
2009
Hyundai
Tucson
Package arrived promptly and installation was straightforward.
Thank you Pat C at etrailer.
Thank you Pat C at etrailer.
by:
Theresa
11/16/2023
2023
Ram
ProMaster 2500
Good communication. Product arrived on time exactly as described. I've ordered many items from etrailer. Always a good experience! Thanks.
by:
John
04/26/2021
Dodge
Ram Pickup
These we the best investment I have made for my Ram Promaster. Before I purchased them it was like I was floating all over the road.
by:
Brett
06/11/2025
Very good equipment
by:
Cindy
10/02/2021
Love them on the Travato. Love etrailer too.
by:
Joshua
11/13/2024
2015
Ram
ProMaster 2500
These work great. Stops body rolling my loaded Promaster van when cornering. 15 minute install.
by:
Attn:
07/20/2020
2018
Ram
ProMaster 2500
Instant difference in my Promaster. Can't believe I waited 9,000 miles to make this change. Highly recommend.
by:
Lex
08/21/2020
The bumpy ride has been minimized. And when rigs goes by us , the rv does stay more stable, but not that much.
It drives a bit more firmer than before.
It drives a bit more firmer than before.
by:
Paul
10/02/2020
2020
Ram
ProMaster 1500
Great customer service experience resolving an issue. Quality product!
25
2544
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Show More Reviews
See what our Experts say about this SuperSprings Intl Vehicle Suspension
- Reducing Stiffness of SumoSprings Solo Custom Helper Springs # SSR-313-54 on 2022 Coachmen Nova 20CFirst you will want to check your 2,800lb SumoSprings Solo Custom Helper Springs # SSR-313-54 to determine if 2nd 1" spacer was installed with the springs. If you have both the 1" spacers you will want to remove the 1" spacer which doesn't have the pressed in nut. This will help to reduce how much the spring compresses under a normal load. As the spring is progressive it will reduce how stiff the spring is and help to smooth your ride. If you are still finding the ride is to harsh you...
view full answer... - 2018 Promaster 2500 SumoSpring RecommendationFor your 2018 Ram ProMaster 2500 the SumoSprings rear suspension kit you'll need is the part # SSR-313-54. This has the most support at 2,800 lbs which will be ideal since you will be converting your setup to a camper. I'd first try it with both spacers. If you find the ride quality is too harsh then maybe take the one out, but I would be shocked if you didn't prefer the spacers. The springs are most likely going to touch all of the time due to the additional weight you are adding.
view full answer... - Suspension Enhancement For a Smoother Ride On a 2022 Coachmen Nova 20C Class B MotorhomeThere are a few different SumoSprings for the rear of your 2022 Coachmen Nova 20C. If you have the lightest 1,000LB # SSR-313-40 springs on your Nova these are not going to provide enough support for all the additional weight added to you camper. A better option would be the 1,500LB # SSR-313-47 or 2,800LB # SSR-313-54 depending on how much cargo you are carrying or towing. Please let me know what you have and the types of loads you are carrying and I can help you determine if there is...
view full answer... - Yellow SumoSprings That FIt 2022 RamPromaster 1500Hey Charles, we have a yellow set of SumoSprings that fits your 2022 Ram ProMaster 1500 with the part # SSR-313-54. Are you trying to gain a little more stability?
view full answer... - Which SumoSprings for 2023 Ram ProMaster 1500 Camper VanHey Chris! Even without towing or hauling heavy loads you're going to have a lot of extra weight from that conversion. The best option is going to be the higher rated SumoSprings Solo Custom Helper Springs # SSR-313-54. The support from their 2,800 lb capacity definitely won't be overkill for your application. They will do a better job preventing and correcting sway out on the highway and in high winds, while also smoothing out your ride. Any big trips coming up?
view full answer... - Will Rear Sumo Springs Work On 2022 Jayco Swift 20T With Jayco J Rite Hellwig Overload SpringsHey Richard, thanks for reaching out. Yes, the rear SumoSprings for the Ram ProMaster 3500 should be able to work along with the Jayco-installed Hellwig overload springs, as long as there is still room at the factory bump stop location. The SumoSprings replace the factory bump stops, so they are not usually fighting the Hellwig leaf/overload springs. They just add progressive support as the rear suspension compresses. I’d recommend just double-check that Jayco didn’t add any brackets or...
view full answer... - Fit of Super Springs SSR-313-54 For Rear Axle of 2014 Ram ProMaster 2500The Sumo Springs Custom Helper Spring Kit you mentioned, part SSR-313-54 is indeed a fit for the 2014 Ram Promaster Van. The kit contains two springs for the rear axle. The springs themselves are rated up to a 2800 lb capacity, but be aware that the springs will not increase the existing capacity of your rear axle.
view full answer... - What SumoSprings Kit to Use on a 2023 Winnebago Solis MotorhomeHey Lenny, thanks for reaching out! We have 2 different colors of the SumoSprings Solo Custom Helper Springs that fit your 2023 Winnebago Solis Motorhome, and the colors are based off of the weight ratings assigned by SumoSprings rather than trying to match the color with what comes factory on your vehicle. Here are the different weight ratings: - Blue # SSR-313-40 (1,000 lbs) - Black # SSR-313-47 (1,500 lbs) - Yellow # SSR-313-54 (2,800 lbs) The black would be great for standard...
view full answer... - What to Do if SumoSprings For 2023 Ram Promaster is Too HarshHey Rudy, if I were in your situation I would try removing a spacer to see if that helps. The real struggle with suspension enhancement is that they typically do create a rougher ride quality and are hard to dial in. The ONLY kit we can recommend for your 2023 Ram ProMaster 3500 that will actually improve ride quality and everything else is the Roadactive kit part # RAS77VR. If you can't find the sweet spot with the SumoSprings this would be for sure what I would recommend for your ProMaster...
view full answer... - Rear Suspension and Sway Bar Recommendation for 2020 Pleasureway LexorHey David, we have great rear suspension enhancement kits that fit your 2020 Pleasureway Lexor Camper like the SumoSprings Solo part # SSR-313-54 but we don't have any of the Old Man Emu shock kits that fit. A rear sway bar like the Roadmaster part # RM52GR would be a great option too. For RV camper vans the rear sway bar upgrades make the biggest improvements.
view full answer... - Recommended Suspension Upgrade for a 2021 Ram ProMaster 3500Yes, you should add the Coil SumoSprings Custom Helper Springs for Coil Spring Suspension item # CSS-1195F to the front suspension on your 2021 Ram ProMaster 3500. These helper springs adjusts progressively to the weight of your load. I have linked a review video below. As far as your air lift system goes for the rear end, I recommend the Air Lift LoadLifter 5000 Ultimate Air Helper Springs with Internal Jounce Bumpers item # AL88233. This system includes a jounce bumper that will stop...
view full answer... - SumoSprings Rear Suspension Enhancement for 2021 Winnebago Solis ProMaster 1500For your 2021 Promaster 1500 Winnebago Solis Pocket the SumoSprings kit part # SSR-313-54 would be a great option for rear suspension enhancement that is confirmed as a fit and would provide up to 2,800 lbs of additional suspension support.
view full answer... - Do Front and Rear SumoSprings Need to be Installed on 2018 Ram ProMaster 2500 Near GVWRSince you are loading your 2018 Ram ProMaster 2500 up to the GVWR I recommend starting off using the SumoSprings Solo Custom Helper Springs # SSR-313-54 for the rear axle. These are the heaviest duty option available which is what you need for your application. If you had a passenger vehicle then I would say that the rear SumoSprings would be enough but since you have an RV I also recommend installing the Coil SumoSprings Custom Helper Springs # CSS-1195F. These will not only assist your...
view full answer... - Recommended SumoSpring Kit for Winnebago Trend 23B Built on Ram Promaster 3500 ChassisSince you want comfort over additional capacity you'd want the lighter duty # SSR-313-40 since it wouldn't be as harsh.
view full answer... - Rear Suspension Enhancement Product for Class C Motorhome to Decrease Sway and Increase Ride HeightAssuming that your RV doesn't already have one, an anti-sway bar like # RM-1129-143 will keep your rear axle tied perpendicular to the frame which will be the most effective way to prevent the front end from getting squirrely on you. However, this option wouldn't affect your ride height. If you already have the OEM anti-sway bar, the addition of SuperSrings # SSA11 will offer pretty effective sway resistance, but would also raise your ride height by about an inch and would also help reduce...
view full answer... - SumoSpring vs Timbren Recommendation for 2017 Ram ProMaster 3500 RV ChassisFor RV applications the SumoSprings tend to be the better choice as they are less harsh than the Timbrens. Because of that I would recommend the part # SSR-313-40 which is a confirmed fit for your 2017 Ram ProMaster 3500 chassis. This is the lightest duty kit available which is the way to go since the higher rated kits are going to make the ride a bit harsher.
view full answer... - Recommended Sumo Springs for 2019 Ram ProMaster 2500 Converted to RV/OfficeSumo Springs are a great solution that are easy to install and don't require any type of maintenance once they're on. I recommend using the SumoSprings Solo Custom Helper Springs # SSR-313-47 because of the springs compress easily at first for soft engagement and a less bumpy ride. These springs are useful for up to 1500-lbs of additional weight in our ProMaster, so they're a good fit for your RV/Office. You could go up to the # SSR-313-54 which are designed to offer 2800-lbs of load...
view full answer... - Suspension Enhancement for Front and Rear of 2018 Ram ProMaster 3500Since your 2018 Ram Promaster 3500 has coil springs in front you'd need the # CSS-1195F for the front and then for the rear # SSR-313-54 like what you referenced.
view full answer... - Recommended SumoSpring Kit for Itasca Viva Motorhome Built on Ram Promaster 3500 ChassisAll three SumoSprings kits fit your 2018 Ram Promaster 3500. The difference is the capacity of each. The # SSR-313-54 is the highest rated at 2,800 lbs, the part # SSR-313-47 is 1,500 lbs, and the # SSR-313-40 is 1,000 lbs. Due to the weight of your motorhome I'd recommend the highest capacity kit # SSR-313-54 which will make the biggest difference.
view full answer... - Why Can't Curt Hitch for 2014 Ram ProMaster be Used with Weight DistributionTypically the hitches that are rated for use with weight distribution systems attach in a few places to the bottom of the vehicle frame. The use a longer mounting flange that helps to handle the additional torque that a WD system puts on the vehicle frame. The Curt hitch part # C13295 instead only attaches to the frame where the bumper attaches and just doesn't have enough contact with the frame to handle the additional stress. To reduce sag you could use rear suspension enhancement as...
view full answer... - Recommended Sumo Springs For A 2019 Hymer Aktiv MotorhomeI can certainly point you in the right direction. For the rear axle of your 2019 Hymer Aktiv Motorhome, I recommend the SumoSprings # SSR-313-54. These are the 2,800 lb capacity jounce springs. They will replace the factory bump stops and do a great job of leveling your ride, and absorbing shock. For the front axle, we do not carry any jounce springs, but you can use the SumoSpring coil helpers # CSS-1195F. This is an insert that goes on the factory coil springs. This will help add support...
view full answer... - Rear Suspension Enhancement Kit for 2017 Winnebago Trend 23CSince there isn't a 2017 Winnebago Trend 23C most likely you have the 23D which for a suspension enhancement kit you'd want the SumoSpring kit part # SSR-313-54 which will give the rear suspension more support and will also do a great job increasing stability.
view full answer...
Do you have a question about this Vehicle Suspension?
Info for this part was:
Edited by:
Leah B
Expert Research:
Mike L
Expert Research:
Jameson C
Video by:
Andrew K
Video by:
Ethan H
Video Edited:
Joshua S
Video Edited:
Dustin K
Video Edited:
Chris R
Video Edited:
Jonathan Y
Installed by:
Cole B
Installed by:
Robert C
Written by:
Mary K
Updated by:
Wilson B
Updated by:
Alex H
Updated by:
Noah M
Test Fit:
Jesse B
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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.