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2019 Keystone Springdale Fifth Wheel
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Timbren Rear Suspension Enhancement System
Part Number: TMBRSP35B
In Stock
$398.07
Retail:$468.32
You Save: $70.25
2019 Keystone Springdale Fifth Wheel
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- Reviews (7298)
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Timbren Vehicle Suspension - TMBRSP35B
Highlights
- Custom Fit for Your Vehicle: Mounts to existing attachment points
- 11,000-lb Load Support: Keeps your vehicle level and steady for safer towing and heavy hauling.
- More Stability When Turning: Reduces body roll so your truck stays balanced in corners or swerves.
- Smoother Ride on Rough Roads: Rubber springs absorb bumps and shocks for better comfort and control.
- Less Sag, More Steering Control: Prevents rear-end drop so handling, traction, and braking stay consistent.
- Simple Bolt-On Setup: Installs easily with included brackets and hardware—no drilling required.
Features to know about
Stay Level and Confident Under Heavy Loads: 11,000-lb Rear Suspension Support
When you’re hauling or towing, rear-end sag can throw off your balance and steering. The Timbren Rear Suspension Enhancement System adds up to 11,000 lbs of rear support to keep your vehicle level and stable when loaded down. Its hollow rubber springs sit above the axle to reduce squat and help your steering and braking stay consistent even with a full bed or a heavy trailer behind you.
Smooth Out the Rough Stuff: Rubber Springs that Absorb Shock
Rough roads don’t have to mean a rough ride. The Aeon hollow rubber springs cushion bumps and potholes, absorbing road shock so you stay comfortable and in control. By taking the brunt of the impact, they also protect your factory suspension from bottoming out and extend its life over time.
Stay Steady in Crosswinds and Turns: Independent Spring Action
When crosswinds or curves push your rig around, these springs work independently to keep each side planted. That independent movement cuts down on body roll and sway so you stay stable through turns, uneven ground, or when a passing semi tries to rock your trailer.
Simple Bolt-On Upgrade: No Drilling or Air Systems Needed
Installing serious load support doesn’t have to be complicated. This system replaces your factory bump stops using vehicle-specific brackets and hardware—no drilling or airline routing required. Once it’s bolted up, it automatically adjusts as weight changes, becoming more rigid as the load increases without any compressors or manual adjustments to worry about.
Built to Last Through Work and Travel: Durable Rubber Construction
The heavy-duty rubber design is built for repeated compression under demanding loads while staying elastic enough for a comfortable ride when unloaded. It’s a straightforward setup that delivers progressive support, stability, and long-term reliability backed by a limited lifetime warranty.
Specs
Weight and Capacity
- Capacity: 11,000 lbs
Included Components
- Includes: 2 Aeon hollow rubber springs, vehicle-specific brackets and hardware for simple installation
Installation
- Replaces: Axle bump stops on frame
- Drilling required: No drilling required
Compatibility and Usage
- Designed to work with: A suspension system that is in good working order
- Vehicle weight limit: Do not exceed the vehicle's weight-carrying capacity
Warranty
- Warranty: Limited lifetime warranty - satisfaction guarantee
MBRSP35B - Rear Suspension Enhancement System with Aeon Hollow Rubber Springs by Timbren
This Product Fits The Following Vehicles
- 2017 - 2017 Pleasure-Way Ascent Motorhome Base
- 2018 - 2019 Pleasure-Way Ascent Motorhome TS
- 2015 - 2015 EverGreen RV Imperial Motorhome 245TS
- 2015 - 2015 EverGreen RV Imperial Motorhome 245WS
- 2018 - 2022 Winnebago Revel Motorhome 44E
- 2007 - 2009 Dodge Sprinter 3500
- 2007 - 2015 Freightliner Sprinter 3500
- 2010 - 2015 Mercedes-Benz Sprinter 3500
- 2016 - 2021 Freightliner Sprinter 3500 2 Wheel Drive
- 2016 - 2021 Freightliner Sprinter 3500 4 Wheel Drive
- 2016 - 2027 Mercedes-Benz Sprinter 3500 2 Wheel Drive
- 2016 - 2025 Mercedes-Benz Sprinter 3500 4 Wheel Drive
- 2013 - 2013 Roadtrek SS-Agile Motorhome Agile
- 2017 - 2019 Roadtrek SS-Agile Motorhome Agile - 2 Wheel Drive
- 2017 - 2019 Roadtrek SS-Agile Motorhome Agile - 4 Wheel Drive
- 2020 - 2020 Leisure Travel Unity Motorhome 24CB
- 2020 - 2020 Leisure Travel Unity Motorhome 24FX
- 2020 - 2020 Leisure Travel Unity Motorhome 24IB
- 2020 - 2020 Leisure Travel Unity Motorhome 24MB
- 2020 - 2020 Leisure Travel Unity Motorhome 24RL
- 2020 - 2020 Leisure Travel Unity Motorhome 24TB
- 2017 - 2025 Leisure Travel Unity Motorhome U24CB
- 2017 - 2025 Leisure Travel Unity Motorhome U24FX
- 2017 - 2022 Leisure Travel Unity Motorhome U24IB
- 2017 - 2025 Leisure Travel Unity Motorhome U24MB
- 2021 - 2025 Leisure Travel Unity Motorhome U24RL
- 2017 - 2025 Leisure Travel Unity Motorhome U24TB
- 2010 - 2010 Four Winds Ventura Motorhome 170S
- 2010 - 2010 Four Winds Ventura Motorhome 170X
Customer Satisfaction Score:
89% were satisfied with this product
11% of customers were not satisfied
- etrailer mistake
- Product did not meet expectations
- Wrong item was ordered
Ratings & Reviews
4.7
7298 reviews
by:
Jorge
08/06/2025
2024
Mercedes-Benz
Sprinter 3500
I put these on my 2025 Mercedes 3500 XD AWD Sprinter EXT 170 by Midwest automotive and absolutely love them. The sway is eliminated by 50% IMO when you pass 18 wheelers and when you get crosswinds from open roads. As you know these vehicles come at about 10,000 pounds curb weight and with these, it lifted my vehicle about 3/4 of an inch in the rear, which made it level out a little more when you don’t have the air suspension. They are not bumpy or anything when you drive on regular roads. You can’t even tell they are on. Installation was pretty quick. I just used the bar to pull the old ones out. I bent the little fins on the frame put the new ones on and bent them back in place.
by:
Glen
06/09/2020
I just installed this on my sprinter/airstream interstate. In the first few minutes of the test drive I noticed the difference. The ride is much more stable. No bounce on the backside of the speed bumps in my neighborhood and less roll in the turns. This is based on the rig unloaded. I imagine it will be more noticeable when loaded in the back storage carrier. I purchased the higher capacity - 11,000 lbs i believe... I watched the etrailer video and one from Timbren on YouTube. With all the additional RV components under the rig, taking off the tires was necessary. It also allowed me to install without getting underneath (sketchy without a lift). After lifting and removing tires, the toughest part is getting the second side of the part in the mount. I used dish soap and worked it in slowly moving from one end to the other. It took about 15 minutes of this repetition to get it to pop in.
by:
Dominic
04/21/2024
2022
Mercedes-Benz
Sprinter 3500
Good product , a real bear to install. I used a small hydraulic jack to push and pry the block into position . A screw driver alone was not the answer.
by:
Patrick
08/26/2025
2012
Ram
3500
I installed these on my 2012 Mercedes Benz 3500 sprinter camper van they improved the rear ride and bodyroll when cornering. While not making it as good as air ride, I would recommend them because of the improvment compared to the cost. I did install them myself with a little bit of effort.
by:
Michael
09/19/2025
It changed the whole driving profile with the addition of a few suspension items. Well worth the time and effort.
by:
Phil
04/18/2023
The YouTube videos to install these items say it is easy. That was not my experience. I had a very difficult time getting the Timbren bumpers into the slots on the vehicle where the factory bumpers were removed. I followed the YouTube procedure of raising the vehicle, inserting one end of the bumpers and as much of the other end as possible, placing a wooden block between the bumper and the bottom support then lowering the vehicle.
I had to repeat this procedure numerous times to get the bumper inserted. Maybe the problem was the temperature which was only about 55 f.The second one was more difficult and I finally had to pry open the holder slot somewhat to get the bumper info the slot. I believe this is one to have a shop install it.
I had to repeat this procedure numerous times to get the bumper inserted. Maybe the problem was the temperature which was only about 55 f.The second one was more difficult and I finally had to pry open the holder slot somewhat to get the bumper info the slot. I believe this is one to have a shop install it.
by:
Loren
04/03/2025
Product work just as described, customer service was perfect and easy sale and shipping.
by:
Daniel
12/01/2017
2014
Mercedes-Benz
Sprinter
Parts for correctly for the sprinter and helped with the load capacity.
by:
Dave
07/14/2019
Helped the motorhome so much
by:
Jose
06/26/2024
It’s good but I wish it’s a big taller
by:
Brian H
06/26/2014
Tricky to install however worth the effort...They work great!
by:
Blooming
08/12/2022
Works as described
by:
jc
10/05/2015
Product worked as stated. Thanks
by:
Tony
03/19/2026
by:
M
01/17/2026
by:
David
09/04/2022
Excellent service again !
by:
Gordon
06/19/2025
by:
Adam
08/12/2026
I'm suitably impressed with the difference i feel.
I have about 250 lbs. of static load with my topper and Decked cargo system. This put my install gap with no spacers just under the reccomended 1 inch minimum.Then add a couple hundred more pounds hauling music gear 100 shows a year, and the stop is resting on the axle.
I feel the absorption of the Timbren material is better than the flimsy stock bump stops. More cushion.
Where i really feel the difference is in the stabilty of excessive side sway when turning while loaded.
I have a gig coming up that will involve some unpaved mountain roads to get there so I think i will have a real goid idea of how these Timbren's will perform.
Instalation took me about an hour at 11 p.m.
The product it of the highest quality in design and build.
And Etrailer is a company that I would not hesitate to buy from in the future.
Thanks Dee Dee.
You rawk!!
I have about 250 lbs. of static load with my topper and Decked cargo system. This put my install gap with no spacers just under the reccomended 1 inch minimum.Then add a couple hundred more pounds hauling music gear 100 shows a year, and the stop is resting on the axle.
I feel the absorption of the Timbren material is better than the flimsy stock bump stops. More cushion.
Where i really feel the difference is in the stabilty of excessive side sway when turning while loaded.
I have a gig coming up that will involve some unpaved mountain roads to get there so I think i will have a real goid idea of how these Timbren's will perform.
Instalation took me about an hour at 11 p.m.
The product it of the highest quality in design and build.
And Etrailer is a company that I would not hesitate to buy from in the future.
Thanks Dee Dee.
You rawk!!
Christopher H.
8/14/2026
Love hearing this! Really appreciate the detailed feedback and photos. That extra stability when you're loaded up can make a huge difference. And installing them at 11 at night—that's commitment. Hope they treat you just as well on those mountain roads. Safe travels and we'll definitely make sure Dee Dee gets the shoutout.
by:
Ryan
08/16/2026
2024
Toyota
Tundra
Timbren Spring Helpers were exactly what I needed on my Tundra plus a spacer kit since I have a 3” TRD lift. They were packaged neatly, with proper hardware, and excellent instructions! They absolutely do exactly what they are supposed to do! Truck rides much better and helps level out the load!
Lazer S.
8/19/2026
Glad to hear they are working well for you, Ryan! Now that they are on, where you headed?
by:
Jay S.
08/13/2025
2022 F250 Super Duty. Super easy to install. I have about 3/4" gap between the spring and the plate. Time will tell how they impact the ride quality and how much sag they mitigate with my 5th wheel hooked up.
Jay S.
8/14/2026
Now that its been a year Im very impressed with them. Theres no ride detriment without the 5th wheel attached and they do a great job of mitigating squat
by:
Don
05/05/2025
Absolutely Pleased with the TIMBRENS. They were easy to install, and took less than an hour to install both. I noticed a slight stiffness in the ride as the rear bounced over a bad roadway. Towing is great, with a nice level and smooth ride. I am glad that I did not order the heavier duty Timbrens, than what was recomended for my truck. I believe the ride would have been too stiff. If you look at the photos showing the timbrens, the truck is still lifted in the rear, so what you see is a big gap between the rubber, and the steal plate. When the truck is lowered, there's 1" of space as it should be. BTW, I have been purchasing from etrailer for years now, and I have to say that I have never had any issues with any orders. They are my go to folks for all of my vehicle suppension stuff and trailer stuff. You can't go wrong with buying from them.
Brooke M.
5/7/2025
Wow, thank you for sticking with us, Don! That is awesome. I think you made an excellent choice here. Timbrens are tough and the heavy duty are SUPER tough. Glad to hear these were a good fit. Love the photos! Is that your own property?
Don
5/21/2026
The TIMBRENs work as stated during when I am pulling anything heavy. However, when the truck is not pulling anything, anyone riding in the rear seat gets a very hard jarring jolt when driving over any roadway repairs, bumps, expansion joints on bridges. I wished that I would have went with the Super Springs, or the Road Active Suspension. I may replace the TIMBRENS later.
Gwendolyn Y.
5/21/2026
@Don I'm sorry to hear that the Timbrens didn’t pan out to be as great as you originally hoped. Swapping over to the SuperSprings or the RoadActive Suspension will definitely have less of an impact on your day-to-day driving. Out of the two, the RoadActive Suspension would have the least effect.
If you ever have questions about the RoadActive Suspension or the SuperSprings, let me know and I’d be happy to help out.
by:
Mitchell
05/02/2026
It has been almost a year since I installed Timbren Suspension Enhancement Systems (DVF350 and DVR350R) on the front and rear of my 2003 Dodge RAM Van 3500. These bumpers replaced the OEM bump stops that were on my van. I like the Timbren bumpers much better than the OEM bump stops because they provide a progressively cushioned response for suspension compression when traveling over significant humps like speed bumps in a parking lot, or curb ramps into driveways. I did not like the abrupt stop the OEM bump stops provided when traveling over the same objects. I installed the Timbren rear bumpers first, and after a few months of use, I decided to add them to the front. In both cases, the front and rear Timbren bumpers were easy to install once the OEM bump stops were removed. Installation required reuse of the factory hardware. On my van, the Timbren bumpers are not always engaged. Under normal load and travel conditions the bumpers are relaxed and about 1/2” away from the suspension landing points. However, their presence is much appreciated and very noticeable when the van is carrying heavy loads or handling significant humps.
Kate F.
5/6/2026
Glad to hear the Timbren systems worked out so well for your RAM Van Mitchell! It’s great that you noticed the smoother, more progressive response compared to the factory bump stops, especially under load. Thanks for sharing your experience with both the front and rear installs, that’s really helpful for others considering the upgrade. What kind of loads are you usually hauling with your van?
by:
Orlando
06/14/2026
The timbres bump stop is exactly the right height to meet the axel when the trailer is connected with all its weight onto the hitch. I have an Andersen weight distribution hitch and it levels out perfectly. The day picture is with the coach (Winn 2100bh) with factory equipment. The night picture is after the timbres are in place. Looks good.
Lazer S.
6/16/2026
They definitely look like they are helping, Orlando! How are they when you aren't towing? We hear a lot of people say they can be pretty harsh when unloaded.
by:
Bud
07/08/2026
Stiffens and corrects kneel in rear end of 2023 Chevy Silverado 1500. You will notice a stiffening of the rear end suspension while unloaded, but it’s a fair trade off to prevent sagging and porpoising while towing. I found it easier to pull the rear wheels and work from the side than underneath the vehicle while installing.
Kate F.
7/13/2026
Bud, thank you so much for taking the time to leave a review! I'm glad to hear the suspension upgrade helped reduce the sagging and porpoising while towing. I also really appreciate you including the installation pictures and sharing your tip about removing the rear wheels. I'm sure that will help the next person tackling the install. Thanks again for choosing etrailer!
by:
Mitchell
08/26/2026
The Timbren overload spring/bumper was east to install and did what it was supposed to do when I hitched up a camp trailer. These did not negatively affect the ride by any means and I don't have to worry about the troubles with air bags.
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See what our Experts say about this Timbren Vehicle Suspension
- Suspension Enhancement For 2023 Mercedes Sprinter 3500xd AWD 4WDHey Doug, our fitguide is sometimes a bit confusing, but the Timbren Rear Suspension Enhancement System # TMBRSP35A you were looking at fits the 2023 Mercedes Sprinter 3500xd AWD/4WD (fits 2wd or 4wd/AWD) if it is a motorhome. If it is not a motorhome, then you'll want the B version which is # TMBRSP35B (2wd or 4wd/AWD).
view full answer... - Which Timbren Kit Does 2025 Mercedes Sprinter 3500 Motorhome NeedHey Bill, the part # T35AV is what you need as the part # TMBRSP35B that you referenced does not work on motorhome chassis like you have. Price difference would be for the different brackets etc. Are you wanting to improve handling?
view full answer... - What Suspension Enhancement can I Add to My 2024 Mercedes-Benz Sprinter 3500 for Sway?Hello Mara, Happy to clarify the difference! The # TMBRSP35B is rated for 11K, while the # TMBRSP35A is rated for 7K. Timbrens are a great option, especially for someone who consistently hauls a heavy load. However, if you’re not carrying that kind of weight all the time, they can make your ride feel a bit harsh when unloaded. If you're looking for something similar to Timbrens but with a smoother, more forgiving ride when not under load, I’d recommend going with SumoSprings. Here are...
view full answer... - Height of Timbren Rear Suspension Enhancement System Item # TMBRSP35B, TMBRSP35A, and TMBRSP25AI spoke with my contact at Timbren and the overall height (with spacers) for the part # TMBRSP35B that you referenced is 6-3/8 inch, the height of the # TMBRSP35A is 5-7/8 inch, and the # TMBRSP25A is 5-3/8 inch.
view full answer... - How Do You Remove the Bump Stops on a 2015 Mercedes Sprinter 3500 to Install Timbren SpringsThe factory bump stops on your RV built on a 2015 Mercedes Sprinter 3500 chassis will have to be cut off and the captured part pushed out in order to install Timbren rear helper springs # TMBRSP35B. There really isn't any other way based on your picture.
view full answer...
- Recommended Timbren Suspension For 2012 Mercedes-Benz Sprinter MotorhomeThe Timbren Vehicle Suspension, part # TMBRSP35A, is the correct suspension enhancement system for your 2012 Mercedes-Benz Sprinter motorhome. This system helps reduce body roll and increases stability, as well as reducing sag at the rear of your Sprinter. The # TMBRSP35B is designed to be used on Van or Cab and Chassis models, and is not a fit for your Class B motorhome. If you need help with the front of your Sprinter I recommend part # TMBFSP35. This helps extend the life of the suspension...
view full answer... - Rear Helper Springs for a 2015 Leisure Travel Vans Unity Built on a Mercedes Sprinter 3500 ChassisI have a great option to add helper springs to your 2015 Leisure Travel Van Unity built on the Mercedes Sprinter 3500 chassis. Since this is considered a motor home I recommend Timbren Rear Suspension Enhancement System Item # TMBRSP35A. The "A" model was designed specifically for motor home editions of the Sprinter chassis. The "B" model, # TMBRSP35B, would fit if your RV just had the cab and chassis part of the Sprinter but not the body. If that is indeed the case then the B model will fit.
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...
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Phil
4/18/2024
A great improvement in the suspension for stability and ride. They are one item added to improve the suspension along with Timbren bump stops in the front, Bilstein B6 struts and rear shocks plus a heavy duty Helwig anti-sway bar. My motor home now rides and drives with great improvement and is so much more stabile.