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  1. Vehicle Suspension
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  4. 2008
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FITS 2008 Workhorse W-Series
SumoSprings Maxim Custom Helper Springs - Rear Axle

SumoSprings Maxim Custom Helper Springs - Rear Axle

Item # SSR-280-54-1
Our Price: $769.99
You Save: $86.12
Vehicle Suspension
Confirmed to Fit
2008 Workhorse W-Series


W22 and W24

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Shipping Weight: 41 lbs
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The best technical support and full vehicle suspension installation instructions. Great price W-Series vehicle suspension and expert service. Workhorse W-Series, 2008 vehicle suspension by SuperSprings Intl are available from For expert service call 1-800-940-8924 to order your SumoSprings Maxim Custom Helper Springs - Rear Axle part number SSR-280-54-1, or order online at
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  • Reviews (266)
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2008 Workhorse W-Series - SumoSprings Maxim Custom Helper Springs - Rear Axle

  • Jounce-Style Springs
  • Rear Axle Suspension Enhancement
  • SuperSprings Intl
  • Extra Heavy Duty

7,000-lb Capacity. Maintenance-free microcellular urethane springs upgrade your Workhorse W-Series's rear suspension. They cushion bumps and support a heavy load to level your ride and minimize sway. Springs attach at top and bottom for constant support.


  • Helper springs upgrade your vehicle's rear suspension for improved driver control and comfort
    • Support heavy rear loads to keep your vehicle level
    • Help to absorb bumps and shocks
    • Minimize sway
  • Progressive load control - springs compress according to the weight of your cargo
    • Lighter loads - springs compress easily at first for soft engagement and a less bumpy ride
    • Heavier loads - springs compress by as much as 80 percent for support
  • Springs work independently from each other to compensate for off-center loads and reduce body roll during sharp turns
  • Springs are connected to your vehicle at top and bottom to provide support even when your vehicle is unloaded
    • Expand up to 50 percent of their height
  • Durable, high-density microcellular urethane
    • Works in temperatures from -25 F to 200 F
    • Resists damage caused by oils, road salts, and UV rays
  • Minimal lateral expansion - springs expand and compress vertically instead of to the sides so they aren't easily damaged when operating in tight spaces
  • Maintenance-free - no tubing to run or air pressure to monitor like with air springs
  • Easy bolt-on installation
  • 2 Springs and necessary hardware included
  • Made in the USA


  • Weight capacity (at 50-percent compression): 7,000 lbs
    • SumoSprings will not increase your vehicle's weight-carrying capacity
  • Limited lifetime warranty
  • 30-Day satisfaction guarantee

Rear Suspension Support

SumoSprings helper springs are great for RVs or motor homes. Heavy rear loads can cause sag as your factory suspension compresses under the weight of the load. This means that the rear axle is trying to support not only the extra load but also the motor home's weight. And because there is less weight on your front axle, your front tires make less contact with the road, which causes problems with traction, steering, and braking. SumoSprings upgrade your vehicle's factory suspension to level your vehicle, improve driving performance, and keep your ride comfortable.

SumoSprings diagram of installation above existing vehicle spring

Each spring in this kit is bolted to two mounting brackets. One bracket is attached to the frame of your vehicle, and the other bracket is attached to the axle, typically above your existing factory leaf spring. Because each helper spring is in full contact at the top and bottom of the suspension's travel, the expanding and contracting action of the SumoSprings enhances your ride under all conditions, not just when it's loaded. And the closed-cell urethane springs act like a shock absorber to dampen road vibration.

SumoSprings compressing under load

SumoSprings provide progressive load control - the more you load them, the stiffer they become. With a lighter load, the springs will compress easily for soft engagement and a less bumpy ride. The springs can also compress by as much as 80 percent to support a heavy rear load and to help your factory suspension bear up under the load. This evens out the weight, which levels your vehicle and ensures that your front tires are making better contact with the road. A level ride means that you have improved driving control, ensures safe headlight aim, and helps to minimize sway. The springs also support your factory suspension, which helps prevent sagging and reduces bottoming out.

The springs work independently from one another to support each side of your vehicle. This action helps to reduce body roll when you make a sharp turn. This also helps compensate for an off-center load.

SumoSprings expanding to allow play in the suspension

These springs extend in height by as much as 50 percent to allow more movement in your suspension when you're traveling unloaded, making your ride smoother and more comfortable.

Durable, Custom-Fit Springs

These microcellular urethane springs are tough. They resist abrasion, oil, salt, and UV rays that can more quickly wear out other springs, and they perform well in temperatures ranging from -25 F to 200 F (-33 C to 93 C).

SumoSprings expand and compress vertically with minimum expansion to the sides, so they won't be damaged by nearby mechanical parts and they fit safely into tighter spots. And unlike air springs, SumoSprings require no maintenance or adjustment.

This kit comes with custom-fit brackets that are designed to easily bolt onto your vehicle.

SSR-280-54-1 SuperSprings Sumo Springs Maxim Rear Workhorse W-Series Suspension Kit for Motor Homes

Replaces SSR-280

Installation Details SSR-280-54-1 Installation instructions

Customer Satisfaction Score:

Customer Reviews

SumoSprings Maxim Custom Helper Springs - Rear Axle - SSR-280-54-1

Average Customer Rating:  4.8 out of 5 stars   (266 Customer Reviews)

7,000-lb Capacity. Maintenance-free microcellular urethane springs upgrade your vehicle's rear suspension. They cushion bumps and support a heavy load to level your ride and minimize sway. Springs attach at top and bottom for constant support.


Gear product and even better service from Etrailer

2007 Fleetwood Bounder Motorhome

The on the high seas sway is gone thanks to the sumosprings and roadmaster sway bar I installed.


While is was a bit of a struggle to get to the bolt location, I am glad I installed these SumoSprings Maxim Custom Helper Springs - Rear Axle. Overall, these help to make the RV ride quite a bit more stable and bounce less. The more stable ride allows to drive around corners a bit faster and with less sway.


These single handily changed the driving experience of our Winnebago Sightseer workhorse chassis. It no longer gets pushed around with passing semis and has substantially less sway. I put off buying these for a couple years because of the price, but they are worth every penny.

2010 WorkhorseW-Series

I put the sumo springs on a 2011 Thor Serrano. The springs dramatically reduced the harshness of the bumps and helped with the swaying (cut swaying by 50% or more). They were easy to install and made it ride much smoother. Their better than I was expecting. I’d do it again.

2003 WorkhorseW-Series

The springs look great. I went to install them today, and was a bit disappointed to find that my W22 is not as depicted in the instructions. I will take it to a shop to have them installed. I am still looking forward to feeling the difference in the ride and handling.
I can only give a 4 star rating at this stage and that is based on the service and delivery from etrailer. They are always good.


Installation went fast and product performs great!


Outstanding product really a big difference in control


Delivery was Very quick considering the distance it had to come. This looks like a really solid piece and when I get it installed I will send pictures

This looks like a very good product. Unfortunately I haven’t been able to get out on the road with it. If it works as well as the front sumo springs I will be very happy.
Craig - 01/11/2021


Noticeable improvement in the stability of the RV

We took a 10,000 mile trip last fall, couldnt imagine that same ride without these springs. Never want to go back to before the install.
Linda W - 02/27/2021

2007 WorkhorseW-Series

I have not yet installed these, but I w ill.



Review from a similar SumoSprings Maxim in Vehicle Suspension

The SumoSprings have reduced the sway when turning. Also, I am not being pushed sideways when a truck passes or during wind gusts as much as prior to installation. But, I think if I do the front springs I would see even more improvement. So, I have seen improvement but I believe more improvements are possible.

I had an rv dealership install the SumoSprings at a cost of $250. The installation is relatively easy. I wish I had done it myself. But, I’m 76 and not as agile as I used to be.


Review from a similar SumoSprings Maxim in Vehicle Suspension

Finally completed my SumoSprings with these rear ones for our 2022 Entegra Vision 29s (Ford F53 chassis V8). A while back, I installed the front SumoSprings and it changed our RV from a “white-knuckling, Nordictrack-exercising, stress-induced-heart-stopping” drive to a…comfortable and sure-footed one.
This time around I installed the rear ones and it complimented the drive even more!! We pull a ~5k lbs utility trailer w/off-road UTV’s and we don’t sway or fishtail as much in the rear anymore! We love SumoSprings!! We have them in ALL of our vehicles!! Highly recommend!
I deducted 1 star for eTrailer. I made the mistake of repurchasing the front SumoSprings again instead of the rears, without triple checking what I bought. I cancelled a minute too late to prevent it from being shipped. Unfortunately, it was shipped and they had to issue me a return label for when it arrives. Thus deducting logistics and restocking fee from my purchase refund.
Granted, it was 100% my fault for the wrong purchase but eTrailer could have given a loyal customer a one time pass.


Review from a similar SumoSprings Maxim in Vehicle Suspension

I bought and installed these for
2012 f53 motorhome chassis. They make the ride too stiff. Does better side roll. But bounces everything inside going down the road. Maybe the next spring level down would be better?

In order for me to better assist you, we will need the Gross Vehicle Weight Rating. Also, please check your rear frame area to make sure it looks flush, like there’s no metal bars or brackets welded on the frame.
-- Etrailer Expert Katrina B - 03/03/2023


Review from a similar SumoSprings Maxim in Vehicle Suspension

I haven't driven the coach with them yet but installation went surprising smoothly. I removed the rear tires to install, the hardest part of this installation was putting those tires back on. No issues with drilling through frame. There were some brake and fuel lines on the driver side rail so I slid a scrap of 3/4" plywood between the frame and rails just to make sure I didn't drill into something I shouldn't have.

My frame already had lower holes, not sure which video but they show installing one of the lower bolts then jacking up the axle until the 2nd hole aligns. Worked like a charm.


Review from a similar SumoSprings Maxim in Vehicle Suspension

One year ago I installed Sumo Springs front and rear on my class A motorhome. This upgrade is the best suspension add on for improved sway control and overall handling. etrailer helped me make the proper choice based on overall vehicle weight and specific chassis. Fast shipping and fair pricing.


Review from a similar SumoSprings Maxim in Vehicle Suspension

The installation is more difficult than the installation lead me to think it would be but once installed the sumo springs contributed greatly to dampening the roll of the RV as it went through ruts and over speed bumps etc. I am a little surprised at how compressed they are after I let the vehicle down on them and I'd appreciate knowing if others have this level of compression. I had considered a 2cm lift for this vehicle but held off for now. Pictures attached.
First pic 4616: Shows that on my rig I had to jack the spring and axle down from the frame in order to get the sumo spring in.
Second pic 2816: shows that I was able to put the sumo sprint in the left of the sway bar bracket (which had to be removed). Next I used pry bars to move it to the right into the bracket where it belongs.
Third pic 5748: shows the spring installed and compressed by the vehicles weight.
Fourth pic 2230: Shows the spring partially installed on the left side. Note that the eyelet on the sway bar bracket on this side (sprinter 3500) makes the install much harder and I had to really jack the springs down to get it on this side.
Fifth pic 0054: Left side installed and sway bar reinstalled. Still unloaded


Review from a similar SumoSprings Maxim in Vehicle Suspension

I had these sumosprings installed on my class A motorhome 1yr ago to eliminate role. I have been extremely pleased to experience a 90% reduction in role and a MUCH smoother ride. The motorhome is easier to drive and maneuver single handed, even in the turns.


Review from a similar SumoSprings Maxim in Vehicle Suspension

I am sure these are very good, the only reason for the low rating is to get attention so no one makes the same mistake like i did.

These DONOT FIT on a 2018 Jayco Greyhawk equipped with the JRide suspension. The Heliwig helper springs are in the way.

etrailer application guide needs to be updated, the picture attached show the Heliwigs are in the way.


Review from a similar SumoSprings Maxim in Vehicle Suspension

As always, eTrailer service and delivery was flawless for me on these SumoSprings for my 2021 WBGO Adventurer 29B Class A. Installation was done by a local WBGO dealer, who noted that it was easy and relatively quick to accomplish. My reason for getting the SumoSprings was to reduce rear body sway in turns and due to wind buffeting. For this, they seem to work well -- there is noticeably less sway now than before -- which is more confidence-inspiring and takes some of the effort out of dealing with passing trucks or brisk gusts of wind (especially from the side). However, as with any suspension modification that effectively stiffens the suspension, the sway reduction is accompanied by a somewhat harsher ride. This is especially noted when crossing bumps, train tracks, and expansion joints. For me, it's an acceptable compromise, after all, the RV is still a truck and will always ride and handle like one.


Review from a similar SumoSprings Maxim in Vehicle Suspension

2017 Newmar Canyor Star: We installed the front & rear SUMO springs and the side-to-side sway improved a lot. Total installation time was less than 4 hours.


Review from a similar SumoSprings Maxim in Vehicle Suspension

The springs them selves are great but I just had to replace all the mounting bolts to frame and straighten the bracket as 7 out of 8 bolts broke, 1 bent and subsequently bent the bracket. I just emailed sumo springs and so far they don't care.

Customer Service will reach out to you.
-- Etrailer Expert Sierra K - 11/01/2021


Review from a similar SumoSprings Maxim in Vehicle Suspension

Well worth the cost and effort. I installed these myself after not finding anyone near me who would do this.

We still love these.
Ron - 10/08/2022


Review from a similar SumoSprings Maxim in Vehicle Suspension

Best upgrade we did on our RV suspension - strongly recommend this for your RV

Show More Reviews

See what our Experts say about this SuperSprings Intl Vehicle Suspension

  • Does SumoSpring Kit part # SSR-280-54-1 Require Drilling
    Not all SumoSpring kits install the same. The part # SSR-280-54-1 that you referenced though does not require drilling unlike others. I attached a set of install instructions for you to check out as well.
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  • Front SumoSpring Kit Fit Recommendation for Fleetwoor Pace Arrow 37A
    Your 2004 Pace Arrow 37A is built on a Workhorse chassis. So for a front SumoSpring set you would want the part # SSR-280-54-1.
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  • Which SumoSprings Fit Fleetwood Pace Arrow 38P
    Looks like your 2008 Fleetwood Pace Arrow 38P is built on the Workhorse W-24 chassis which means the correct SumoSprings you need is the # SSR-280-54-1 for the rear axle and part # SSF-280-47 for the front axle.
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  • 2003 Gulfstream Sun Voyager Workhorse M-8368
    For the Chevrolet "Workhorse" chassis that your motorhome sits on we will need to determine which of four model series it could be. This can be determined by looking at the 6th character of the VIN. "A" is the W24 chassis "6" is the W22 chassis "3" is the P32 chassis "5" is the W22 chassis Since yours is a 5 you have the W22 chassis. My contact at SuperSprings recommeneded the SumoSprings # SSF-280-47 for the front and the SumoSprings # SSR-280-54-1.
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  • SumoSprings That Fit for 2004 Gulf Stream 8368 MXG on Workhorse W22 Chassis
    We do have both front and rear SumoSprings (made by SuperSrings) which fit your 2004 Gulf Stream 8368 MXG on a Workhorse W22 chassis. The correct fit for your motorhome are the following: - Rear: SumoSprings Maxim Custom Helper Springs # SSR-280-54-1 - Front: SumoSprings Solo Custom Helper Springs # SSF-280-47 These will do a great job helping to keep your Gulf Stream stable and balanced for a smoother, more controlled ride.
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  • Recommendation For SumoSprings That Work With 2010 Workhorse W20 Or W22 Chassis
    Based on your information, I recommend the 5 inch tall SumoSprings Solo Custom Helper Springs, Item # SSF-280-47, for your front axle and they work with W20 or W22 variations of your 2010 Workhorse chassis. For rear axle support, I recommend the 8-1/2 inch tall SumoSprings Maxim Custom Helper Springs, Item # SSR-280-54-1.
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  • Suspension Enhancement For 2003 Winnebago Adventurer on Workhorse W22 Chassis
    We don't have any repairs we can offer for flattened leaf springs, with the best thing we can offer being suspension enhancement (this won't replace your leaf springs, so you'll need to get those, but the suspension enhancement can help). I believe a 2003 Winnebago Adventurer is on a Workhorse W22 chassis though you'll need to verify that as there aren't records going back that far I can find, but if so you can use SumoSprings to help support your rig, allowing you to stay level and help...
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  • Recommended Front & Rear SumoSprings for a 2005 Fleetwood Bounder Workhorse 32W
    For your 2005 Fleetwood Bounder Workhorse 32W Motorhome you can use the SumoSprings Solo Custom Helper Springs # SSF-280-47 for the front axle and the SumoSprings Maxim Custom Helper Springs # SSR-280-54-1. The front springs have a maximum weight capacity (at 50%) is 1,500-lbs, and 7,000-lbs for the rear, and will work in temperatures ranging from -25°F to 200°F.
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  • What SumoSprings Will Work For My 2011 Tiffin Allegro 30GA
    We have the SumoSprings that will fit your 2011 Tiffin Allegro 30GA. If you have the Ford chassis, you will the following options: For the front, SumoSprings Rebel Custom Helper Springs - 2 Piece - Front Axle, part # SSF-170-40-2 For the rear, SumoSprings Maxim Custom Helper Springs - Rear Axle, part # SSR-180-54-1 If you have the Workhourse chassis, your options are as follows: For the front, SumoSprings Solo Custom Helper Springs - Front Axle, part # SSF-280-47 For the rear, SumoSprings...
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  • SumoSprings Helper Springs For a 2008 Fleetwood Bounder 35E Motorhome
    Your 2008 Fleetwood Bounder 35E could have built on either a Ford F-53 chassis or Workhorse W-22 chassis. You will need to verify your chassis to select the correct kit. If you are unsure the chassis information is located on a decal near the drivers seat. The Ford chassis will use the SumoSprings Rebel Custom Helper Springs # SSF-171-40-2 for the front and SumoSprings Maxim Custom Helper Springs # SSR-187-54-1 for the rear suspension. The Workhorse chassis will use the SumoSprings...
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  • SumoSpring Recommendation for 2005 Workhorse W-22 Simba 36 DBD Towing Trailer
    If you plan to do some towing with your 2005 Simba 36 DBD Workhorse W22 then a rear set of SumoSprings like the part # SSR-280-54-1 that you referenced would be a great choice. This will give the rear suspension more support to help prevent sagging and give you the best overall towing experience. In your last sentence you said were trying to push as much weight to the rear of the trailer as possible. You should note that's not an ideal way to load the trailer. This will most likely cause...
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  • Which Steering Stabilizer Fits 2003 Pace Arrow Model 35G
    Yes, the Roadmaster Reflex Steering Stabilizer part # RM-RBK13-RSSA that you referenced has been designed to fit the Workhorse W-22 chassis you have on your 2003 Pace Arrow 35G so it would work well for you.
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  • Suspension Enhancement Options for 2004 Gulf Stream Sun Voyager on Workhorse W22 Chassis
    We do have a number of suspension enhancement options that are going to fit your 2004 Gulf Stream Sun Voyager 8368MXG built on a Workhorse W-22 chassis, but there isn't a SuperSprings Stabilizer and Sway Control Kit for this motorhome. The best option for sway control for your motorhome is a rear anti-sway bar because they are better constructed with higher-strength, thicker steel than OEM sway bars. This means the bars are stronger with much higher roll stiffness to combat sway, and their...
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  • How To Stop Sway on 2006 National Dolphin with Workhouse W22 Chassis
    The best option we have to reduce sway on your 2006 National Dolphin with Workhorse W22 Chassis is an anti-sway bar, the Roadmaster Front Anti-Sway Bar part # RM-1259-105 and the Roadmaster Rear Anti-Sway Bar part # RM-1259-109. These will both do an excellent job of reducing side to side rocking of the body i.e. body roll while cornering or with passing motorist. If you still require further support, you can add SumoSprings which also work to reduce side to side sway as well as front...
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  • Determining The Correct Suspension Enhancement Components For 2006 Damon Intruder 38
    Since your 2006 Damon Intruder 38' could use the Workhorse 22 or the Ford F-53 Chassis you will need to confirm which engine your motorhome has. If your Intruder has the Chevrolet Vortec engine you have a Workhorse 22 chassis and will need SumoSprings # SSR-280-54-1 for the rear axle, and # SSF-280-47 for the front axle. For a front anti-sway bar you will need # RM-1259-105, and # RM88RR for a steering stabilizer. If you have a Ford V10 engine then you have the F-53 chassis and will need...
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  • Recommendations For Reducing Sway And Body Roll In A 2004 Fleetwood Bounder 35E Workhorse W22
    With your Fleetwood Bounder being a 2004, I was unable to find out if it did or did not come with factory sway bars. However, this does not mean they cannot be added if there are no factory ones, or upgraded if there are. With that said, let's get into it. As a side note, all of these are designed to fit the 35E Workhorse W22 and are American made. To start, we have the Roadmaster Rear Anti-Sway Bar # RM-1259-109. This has a 1-3/4" diameter and will be more robust than factory sway bars....
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