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SuperSprings Suspension Stabilizer and Sway Control Kit - OEM Leaf Springs Above Axle
Part Number: SSA11MTKT
In Stock
$765.98
Confirmed to Fit
2015 Thor Siesta Sprinter Motorhome
24SA
24SL
24SR
24ST
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- All Info
- Reviews (72)
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2015 Thor Siesta Sprinter Motorhome - SuperSprings Suspension Stabilizer and Sway Control Kit - OEM Leaf Springs Above Axle
Highlights
- Designed to Fit Your 2015 Thor Siesta Sprinter Motorhome: Mounts to existing attachment points
- 1,650-lb Load Support: Keeps your truck level and stable when towing or hauling heavy loads.
- Less Sway, More Control: Reduces body roll by up to 30% for safer handling in wind or corners.
- Zero Maintenance Required: No air lines or pressure checks—springs adjust automatically to load.
- Quick DIY Install: Bolts on above factory springs with no drilling; extra kit included for above-axle setups.
- Custom Ride Options: Choose shackle setting to balance support, height, and unloaded ride comfort.
Features to know about
Stay Level and Confident Under Heavy Loads: 1,650-lb Suspension Support
When towing or hauling heavy gear, sag can throw off handling and braking. The SuperSprings Suspension Stabilizer and Sway Control Kit adds 1,650 lbs of load support above your rear factory leaf springs to keep the truck level and steady. The helper springs engage automatically as your OEM springs flex under load, lifting the rear back up and preventing bottoming out when the weight gets serious.
Cut Down on Sway and Body Roll: Up to 30 Percent More Stability
Crosswinds, passing semis, or tight corners can make a loaded vehicle feel unsettled. These helper springs act like sway bars by stabilizing your factory leaf springs and cutting sway by up to 30 percent. Each spring’s roller ends activate only when needed, keeping your ride balanced through corners and firm in windy conditions or rough highway stretches.
Automatic Load Response with No Air Lines or Adjustments
Unlike air systems that need constant monitoring, these springs adjust automatically to the load you carry. Rollers engage under pressure and disengage when unloaded, so there’s no air pressure to check or lines to maintain. It’s a maintenance-free setup that reacts instantly to changing weight, keeping your suspension balanced without any extra work.
Customizable Setup for the Ride You Want
The shackles have multiple mounting hole options so you can fine-tune how much support you get. Choose a higher setting for constant heavy loads or older suspensions showing some fatigue, a lower setting to keep factory ride quality, or a middle setup that balances both. The included mounting kit ensures quiet operation with OEM leaf springs that sit above the axle.
Simple Bolt-On Installation—No Drilling Required
Installing these helper springs is straightforward with basic tools. They bolt directly above your existing factory springs using the included brackets and hardware—no drilling needed. Once mounted, the system extends the life of your suspension, brakes, and tires by better distributing weight across the frame points built for heavy duty work.
Specs
Weight and Capacity
- Weight capacity: 1,650 lbs
- SuperSprings will not increase your vehicle's weight-carrying capacity
Dimensions
- U-bolt length: 4"
Warranty
- Limited Lifetime warranty
- 30-Day satisfaction guarantee
SSA11MTKT Super Springs Leaf Spring Suspension Enhancer - Anti Sway - Includes MTKT SuperSprings Mounting Kit
Alternate Instructions
Ratings & Reviews
4.7
72 reviews
by:
Timothy
02/08/2019
2018
Mercedes-Benz
Sprinter 2500
The kit looks really good but I can’t figure out how to install. Enclosed are two photos showing my van suspension and the parts your sent. The instructions do not show my van with only one spring. Can you advise?????????????? Thanks.
Timothy
2/9/2020
Springs are working wonderful after I figured out the install,. The initial problem was all my fault for being a man and not really reading the instructions haha. All is well
by:
Lyman
09/17/2021
Can not believe the conversion did not include beefing up suspension! Much superior ride with Supersprings and less complicated than airbags. Also added new Sumo shocks front and rear. They also removed the sway bar because of generator installation.
by:
Alan
09/14/2022
2015
Mercedes-Benz
Sprinter
This leaf springs kit help greatly. It helps stabilized the van and gives it a much better ride. I would highly recommend this kit.
by:
Jim
08/15/2022
2006
Mercedes-Benz
Sprinter
After installing these products on my 2006 Dodge Sprinter the van rides a lot smoother and with very much reduced sway.
by:
Jeffrey
04/12/2022
2019
Mercedes-Benz
Sprinter 3500
The staff at etrailer really did a good job on my order , they made sure that it’s the right part and keep me updated on the status of delivery.
by:
Scott
12/31/2021
2021
Mercedes-Benz
Sprinter 2500
by:
William
04/03/2026
by:
Tamer
07/16/2021
by:
Chris
09/22/2026
Works excellent for my application. Noticed a difference in the vehicle stance and handling immediately. Kit came with parts not needed that were for other vehicle axle types and not enough 1/2” washers is the only reason for not giving 5 stars.
by:
Howard
10/24/2019
The Super Springs work great! I pull a 8,500# trailer with a hitch weight of 950# with a 2004 GMC Sierra 1/2 Ton. The truck pulls fine but even with an equalizer hitch still had some sag. The Super Springs were easy to install and leveled the rig. After a year everything still works great.
Howard
11/9/2020
One Year later still no sag.
by:
Andrew
12/08/2025
I have ordered a few things from etrailer and they have been on top of things As for this particular item (super springs) I’m very impressed!!! I have a very heavy over loaded truck I typically run 70 to 80 psi in air bags I had my doubts that it would put me at my ride height that I wanted it’s exactly where it needs to be I hope it holds the same or close to it when I hook to my trailers. wish I would have taken before and after pics but again very impressed and would highly recommend
by:
Phillip
10/16/2019
2001
Chevrolet
Silverado
Overall, the installation of the SuperSprings kit went pretty well. The instructions sent with the kit were not all that clear, but the info on etrailer's website saved the day. Can't wait to put the camper back on the truck and see how it rides!
by:
Douglas
06/05/2025
2006
GMC
Sierra
These helper springs were installed on my 2006 GMC Sierra 2500 HD with 92K miles. Previously, I had used Timbren "enhancers". I like the super springs much better. The ride is much better with the SS. Driving over a speed bump no longer results in whiplash that the Timbren enhancers caused. With a 1000# slide in truck camper the truck sits level. There is not a lot of sway in cross winds. I did install a rear sway bar so that the truck handles normally when my wife drives it loaded. I also tow a boat while the camper is in the bed and there are no negative aspects to this. I recommend the Super Springs for load control on a 06 GMC.
Brooke M.
6/11/2025
That's awesome, Douglas! Great to know these have been the solution you were looking for. The Timbrens are known to be pretty stout for sure. I can totally see how these would have the right amount of give needed to support the camper and have a smooth ride :) Have you taken out the truck and camper recently?
by:
Wilfredo
10/06/2026
Fast delivery!
by:
Thomas
05/16/2026
Great price fast shipper easy to work with on ordering
by:
Conrad
08/18/2020
2019
Ram
2500
If you watch the video on installation from the model - SSA13MXKT, you will see how to install them, that's why I don't have any pictures. It took me about 2-1/2 hours to install. The brackets were a plated color and I painted everything black before installed them. My truck was pretty clean underneath so I think they look better. I installed them on a 2019 GMC Denali HD 2500 Duramax. As far as handling, after the install, I did not notice too much difference empty. But - when I had my 5th wheel hooked up, there was a difference, not a significant amount, but a difference. My pin weight on the trailer is roughly 1,350 lbs. also. Now for the dimensions here is what I got - I would say, these dimensions are within an 1/8". The dimensions were taken from the center of the tire to a line on the truck, front and rear.
BEFORE INSTALL -
Rear - 43"
Front - 40-1/8"
AFTER INSTALL -
Rear - 44"
Front - 40-1/16"
WITH MY CAMPER HOOKED UP
1,350 lbs. Pin Weight (CAT Scale Certified)
Rear - 42-5/8"
Front - 40-1/8"
As you can see, it dropped the truck down 1-3/8". Before the install my truck would "squat" approximately 2-1/2" So, they made a big difference, an 1-1/8" difference. Before the install, the front was about (I never got a good measurement on that) 41".
BEFORE INSTALL -
Rear - 43"
Front - 40-1/8"
AFTER INSTALL -
Rear - 44"
Front - 40-1/16"
WITH MY CAMPER HOOKED UP
1,350 lbs. Pin Weight (CAT Scale Certified)
Rear - 42-5/8"
Front - 40-1/8"
As you can see, it dropped the truck down 1-3/8". Before the install my truck would "squat" approximately 2-1/2" So, they made a big difference, an 1-1/8" difference. Before the install, the front was about (I never got a good measurement on that) 41".
Conrad
8/19/2021
After about one year, these are still working great. I typically use my truck for pulling my 5th wheel. But - even when empty, you dont really feel anything different. When the camper is on, it sure levels the truck and camper out perfectly, giving you a great ride.
by:
Chris
11/08/2024
2023
Chevrolet
Silverado 3500
We purchased the product and it arrived on time, scheduled the mechanic to install the springs at the mechanics shop on step 1 of the instructions that we needed a special bolt kit for an additional $120.00 this was very miss leading. We ordered the additional bolt kit should be delivered on 11/18/24 we will see what is next. It would have been nice to have a pop up or some type of information warning us of the additional bolt kit when ordering the product stating we needed to purchase and additional kit. Im not to impressed with the purchasing part of the SuperSprings experience, hopefully they will be a superior product so I can forget about the bad experience. We will see
Victoria H.
11/11/2024
Hi Chris, there should've been a hardware kit for suspensions with leaf springs that sit above the axle. Please let me know if this is the hardware kit that was missing, and I can help you get this resolved.
by:
Jeffrey
01/13/2026
Chevrolet
SS
Used to sell SS, easy effective upgrade as usual....
by:
Andreas
09/09/2018
2002
Chevrolet
Astro
Very pleased! There are two settings, but I prefer the heavier capacity setting and higher in the rear feeling. It has made all the difference in the world with my long wheelbase 2002 Chevrolet Astro Van. I really do not feel that it has changed my ride comfort that much, very little, if any. I always have some kind of load on the van, whether hauling cargo in the van, or towing a trailer, that my ride is still as smooth as always. But, the remarkable thing is, that now my rear end isn't sagging to the ground like it always use to be, even without a load! I'm super pleased and would recommend these springs to everyone for the reasons I've shared above.
by:
2011 Silverado
11/21/2020
I bought these for my 2011 Silverado 1500 crew cab 4wd, truck had a 6” lift and 35” tires. I was frequently towing a 5k pound horse trailer ( bumper pull not gooseneck ) and was getting a lot of bounce in the truck. As a honest review, I installed them ( quick and easy I add ) and removed them a month or so later. They did everything they were suppose to, sway was better, felt more In control at high speeds, and less squat on the truck. My complaint was my truck rode like a 3/4 ton truck without the trailer and I didn’t have 3/4 ton power. So I removed them to get my ride quality back, eventually selling the truck and buying a 3/4 ton. Now in another 3/4 ton for a few week, I would say it wasn’t as bad as a true 3/4 ton, but it does firm up the ride a bit. I still give it 5 stars because it did exactly what it was suppose to, super cost effective, easy to install and remove, no fabrication etc. also I requested some precise measurements on individual pieces from etrailer customer service for fitment with my lift kit and they responded same day with all measurements I needed.
Sum up if your debating, it’s easy to install, easy to remove, way cheaper than bags, adjustable, work great.
Sum up if your debating, it’s easy to install, easy to remove, way cheaper than bags, adjustable, work great.
by:
Larry
10/02/2021
Packages arrived on time, everything was there, installation went good, I removed the rear tires to make it easier, picked the rear of the truck up by 1 3/4 inches, have not hooked up 5 th wheel yet, we will see if it helps with the bottoming out .
Larry P.
10/3/2022
They work great, they improved the rear suspension so there is no more bottoming out when I pull the 5 wheel Rv .
by:
Phil
08/29/2024
Ram
2500
I used the SuperSprings to help support my Slide In Camper for my 2500 Chevy. They support good. I have Timbren installed also, but were bottomed out. After adding the SuperSprings with the Timbren the camper is supported good. The truck sits and rides level
by:
Simpler and more reliable than airbags.
11/18/2020
The springs, I’ve used on a couple different vehicles over the years, as I’ve also used several air bag set ups, I wanted the simplicity of a one and done for the life of the vehicle kind of setup. This is what I get with these. Install was fairly easy with my available tools and I would easily recommend these to anyone that wanted something purposeful, reliable and straight forward. I load the van with ADV motorcycles, Dirtbike’s and trailers full of gear, supplies and wood and they do just fine, keep a level ride and don’t say in the least. Satisfaction thus far! application
by:
Chris
03/16/2018
This product is a must if you are looking for a pleasant ride empty, yet still have additional capacity when you need it. I purchased it because I haul a Lance 1062 camper and was not pleased with the air bag setup I had been using. The air bags would handle the load just fine, but I got a lot of side to side motion while going around corners. I even set each air bag up independent of the other. The SSA15 kit eliminated the side to side motion. It really does act like a sway bar. I recommend you remove the rear tires when you install, it will make it much easier.
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See what our Experts say about this SuperSprings Intl Vehicle Suspension
- Correct SuperSprings for 2007 Winnebago View on Dodge Sprinter ChassisHi Tim; the correct SuperSprings for your 2007 Winnebago are the # SSA11MTKT. These will help reduce the sway you're experiencing and also add extra support to prevent sagging.
view full answer... - Improving Handling and Parked Stabilization of 2017 Winnebago View 24JThe best solution for ride quality and stability for your 2017 Winnebago View 24J will be with a SumoSpring # SSA11MTKT installed. This gives better suspension support that translates the best into improved handing, comfort, and support. Scissor jacks like the part # TJSCHD-24 will do a great job supporting the RV when parked too. For a sewer hose storage container that will work with the above hose, I recommend the Valterra RV Sewer Hose Carrier part # A04-3460BK which has an inner...
view full answer... - SuperSprings Rear Helper Springs on 2016 Mercedes Sprinter 2500 are Not EngagingHaving that slight gap between the new SuperSprings # SSR-329-47 and the platform they make contact with is common not just with this brand but with others as well. It allows your suspension to compress some so as not to have too much of an effect on the unloaded ride quality. Since the springs are not engaging at the rear of your 2016 Mercedes Sprinter 2500 that means that the factory suspension is not compressed enough. And that means that the amount of weight you have in the van is...
view full answer... - Helper Spring Recommendation for 2019 Mercedes Sprinter 2500You're correct, the SumoSprings Rebel such as part # SSR-327-47-2 is compatible with 4WD vehicles only. For a 2WD vehicle, I'd recommend the SumoSprings Solo, part # SSR-330-47 which would add 900 lbs of support for your payload. For a higher capacity, up to 1650 lbs of support, go with the SuperSprings # SSA11MTKT. Both systems will add support and reduce shock as well as minimizing sway. The SumoSprings Solo mentioned above won't alter the factory ride height while the SuperSprings...
view full answer... - Recommended Suspension Enhancement for Mercedes Sprinter 2500 RVIn general, you could go one of two directions on this, but I think your best option is going to be with a leaf spring assist type solution, since they're going to provide the best sway control because they create an added layer to your existing leaf springs. However, what you're able to use is going to be dependent on whether or not your Sprinter has 2wd or 4wd. If you've got a 2wd model MB Sprinter, I recommend using the SumoSprings # SSA11MTKT because they're going to help control sway...
view full answer... - Suspension Enhancement Options for Winnebago View Based on 2015 Mercedes-Benz Sprinter 3500We do have suspension enhancement products for the 2015 Mercedes-Benz Sprinter 3500 on which your Winnebago View is built. These are displayed on the linked pages and include jounce-style bumper springs and a leaf spring kit # SSA11MTKT from Super Springs that works with the 2WD model. You do not mention the specific ride quality issue you're trying to fix but typically Class C RVs suffer from sway more than anything else. Rubber jounce springs stiffen the rear end, not exactly what...
view full answer... - Rear Axle Suspension Enhancement Kits for 2012 Mercedes-Benz Sprinter 3500 Cab and Chassis FlatbedWe do offer several rear-axle kits and a front axle suspension kit for your 2012 Mercedes-Benz Sprinter 3500 Cab and Chassis Flatbed but none of these is an air spring. All available suspension enhancement products for your vehicle are jounce or leaf spring types. The Timbren front-axle jounce spring kit we offer for your 3500 is # TMBFSP35, which is a no-drill bolt-on kit. For the rear axle you have several options including overload pads # TLA7311 from TorkLift that can be easily removed...
view full answer...
Do you have a question about this Vehicle Suspension?
Info for this part was:
Video by:
Andrew K
Written by:
Tricia G
Expert Research:
Jameson C
Expert Research:
Jeffrey L
Updated by:
Mary K
Updated by:
Wilson B
Updated by:
Alex H
Updated by:
Michael B
Updated by:
Noah M
Updated by:
Carrie F
Installed by:
Robert C
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Mike L.
2/8/2019
If you look at page 4 of the instructions which Ive linked for you, you can see photos showing a single leaf spring set up just like whats shown in the photos you provided thanks for the photos!. Im guessing that page was not included in your instructions for some reason.
Helpful Links
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