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When you’re hauling gear or towing a trailer, the rear end can sag and throw off your balance. The Timbren Rear Suspension Enhancement System adds up to 7,000 lbs of load support with hollow rubber springs that sit above the axle. They keep the vehicle level under weight so steering, braking, and traction stay consistent. The system works with your existing suspension to take strain off the stock components and maintain a confident ride when loaded down.

Bumpy roads and rough terrain can make long hauls uncomfortable. The Aeon hollow rubber springs in this setup act like shock absorbers, soaking up bumps and road vibration. Their progressive design means they stay soft under light loads but get stiffer as more weight is added, giving you a smooth, stable ride whether the bed is empty or full.

When a trailer sways or a curve pushes you around, these springs step in to keep things level. Each spring works independently on its side of the vehicle, cutting down on body roll and sway during sharp turns or uneven loads. That independent motion helps keep both sides planted so your handling stays predictable even when conditions change.


Getting more stability shouldn’t mean tearing apart your suspension. This system bolts directly onto the frame rails above the rear axle using custom brackets and hardware—no drilling required. The rubber springs replace your factory bump stops and are designed to work with a suspension that’s already in good shape. With no airlines or compressors to manage, it’s an easy install that’s built to last with a limited lifetime warranty.

Customer Satisfaction Score:
87% were satisfied with this product
13% of customers were not satisfied
Ratings & Reviews

Steven F.
6/14/2017
After a year I would rate these as excellent. They have done everything I wanted and the Navion is substantially more stable. Most people add the back ones and that did help but then added the front ones and everything improved. The system seems very balanced and is know an ease to drive.

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

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?

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.

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Jon L.
8/16/2015
I am going to install the Timbren MBRSP35A - Rear Axle SES Suspension Upgrade on my RV, but until they arrive, I re-installed the original that I took out for dimensions. I did quickly discover the difficulty of re-installing it, but also found a trick that helped and once found it installed fairly easy. As mentioned above, install one end of the rubber mounting tab into the bracket on the frame. Next, dont try to get the opposite tab in all at once...start with the inside corner of the tab, and with a large screw driver, begin working from the inside towards the outside, stuffing it just a little at a time...no soap, no lube...it just slipped right in.I hope that helps. I think the MBRSP35A - Rear Axle SES Suspension Upgrade will even be easier because you at least have the full body to grip and apply pressure as you work the screwdriver.