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When the back end starts to sag under the weight of a heavy trailer or bed load, these hollow rubber springs step in to keep things level. The Timbren Suspension Enhancement System – Rear Axle adds up to 3,000 lbs of capacity to help stabilize your vehicle and maintain proper ride height when hauling or towing. With resistance that works in sync with your factory suspension, steering, braking, and traction all stay consistent even when the load is heavy.
Standard bump stops can hit hard when you bottom out, but these hollow rubber springs compress progressively as weight increases. The convoluted design collapses along its folds and then stiffens as it stacks, keeping the ride smooth under light loads and firm when things get heavy. That extra give takes the sting out of potholes and washboard roads while extending the life of your factory suspension.
When a curve or crosswind tries to push you around, each spring reacts on its own to keep both sides planted. This independent action cuts down body roll and sway so the vehicle stays more stable through turns or when hauling uneven loads. Even if a trailer starts rocking from a passing semi or strong gust, these springs help dampen that motion so the ride feels more controlled.
There are no compressors, air hoses, or valves to worry about. The system installs directly onto the frame above the rear axle using vehicle-specific brackets and hardware, with no drilling required. Once bolted up, it provides continuous support automatically—no adjustments needed before each trip. It’s a simple way to reinforce your suspension for hauling and towing without adding extra maintenance.
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
Ratings & Reviews
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.
Gwendolyn Y.
5/21/2026
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.
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!
Robin H.
9/22/2026
Thanks for taking the time to share such a detailed review and all of the pictures! The unloaded ride is a concern we hear fairly often with SES upgrades, so your experience with the 1" gap and rough-road testing will be really helpful to others considering these for their F-250. We appreciate the kind words about Naomi and our team as well. Looking forward to your update once you get some miles on them with the Rockwood!
Heather A.
4/24/2026
Hi there, thanks for reaching out, that’s actually a common issue with this type of trim. The one you tried is a standard flat insert, but some RVs (like your NOBO) use a slightly domed trim to help it sit over the screw heads in the track. If the screws stick up even a little, a flat trim won’t fully snap in place, which sounds like what you’re running into. The best way to find the right replacement is to remove a small piece of your original trim, lay it flat, and measure the full width from edge to edge. Most are either 3/4" or 1", but the shape matters too, not just the width. If yours has that domed profile, you’ll want something similar or a softer vinyl that can flex over the screws. If you’re able to send a quick photo of your track or old trim, I’d be happy to help you find a better match.
Mike L.
4/23/2026
Niiiice, I see what you did there!! That looks like a sweet setup!
Mike L.
4/23/2026
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Ryan C.
6/28/2018
These are still holding up great a year later. I’ve pulled a loaded trailer twice in the last month and it keeps the Xterra perfectly level. I have not noticed any harshness in the ride with a loaded trailer, but when not towing it can get a little bumpy on rough roads. Not enough to cause any controversy problems and I still think these are an easy solution.