To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
When you’re towing a trailer or hauling a heavy bed load, rear-end sag can make your truck feel unsettled and throw off your handling. The Timbren Rear Suspension Enhancement System adds up to 8,600 lbs of rear suspension support, sitting just above the axle to keep your ride level and steady. The hollow rubber springs stiffen progressively as weight is added, reducing squat and maintaining traction so your steering and braking stay predictable even under heavy load.

Bumps and rough roads can beat up both you and your suspension. Timbren’s hollow rubber springs compress along their convoluted folds to soak up road shock and vibrations before they reach the cab. When the road gets rough, the springs take the brunt of the impact instead of your leaf springs, giving you a smoother, more controlled ride while helping extend the life of your suspension components.

When cornering or dealing with crosswinds, each Timbren spring acts on its own to keep your ride stable. The independent spring action helps reduce body roll when you swerve or turn sharply and compensates for off-center loads that could otherwise throw you off balance. The result is a more planted feel through corners and less sway transferred from a trailer down the highway.


Installing extra load support doesn’t have to be complicated. The Timbren system bolts directly onto existing frame mounts using vehicle-specific brackets and hardware—no drilling or air lines required. There’s no compressor to maintain or PSI to adjust; it’s a passive system that stays out of the way until it’s needed, then automatically provides support as load increases. Just bolt it on and go, knowing it’s ready whenever your rear suspension is under pressure.

Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
Ratings & Reviews

Charles
5/8/2022
This product has been on my truck for a year now, and with more than dozen long trips with truck fully loaded, these cushions have keep my truck level and well clear of the frame. Id still give them 5 Stars after a year of use.

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!

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.


Lazer S.
8/19/2026
Glad to hear they are working well for you, Ryan! Now that they are on, where you headed?

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

Christopher H.
9/3/2026
Happy to hear the Timbrens are making that big of a difference Tony. Thanks for including the photo and we appreciate the kind words! Have you taken any longer trips with the Timbrens installed?


Jesse M.
9/10/2026
Awesome! Glad to hear the Timbrens made such a big difference in the ride quality. Thanks for sharing! Happy travels!

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.


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?

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!

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.
4/2/2026
Glad to hear they worked well for you Jerrod. Hope you had a good trip!

Lazer S.
7/20/2026
Glad they are working well for you, Kevin! Well, while you are towing, that is. We have heard that these can be pretty rough when unloaded, but work great when you are loaded. A quick release function on these would make taking them off when not towing a lot easier. I may pitch that to Timbren to see if they can work something out. I will tell them to call it something like the Kevin Device if they agree! ^___^ Sounds like quite the trip! What has been your favorite stop so far?

Mike L.
2/26/2026
Thank you Darrell, we're glad to hear your Timbrens are still on the job!

Kate F.
4/23/2026
Thanks for sharing your experience Thomas. It is great to hear the Timbrens made a noticeable difference in ride quality and reduced body roll on your E350 Class C. We also appreciate the heads-up on the install. That kind of real-world feedback about brake line clearance is very helpful for others working on a similar setup. Would be nice if they had a stronger option, if you need the 5K, might need to go to airbags, but who wants to deal with having to air up if you don't need to. Where are you off to on the next adventure?

Mike L.
7/7/2026
Nice setup David, thanks for the photo!
Do you have a question about this Vehicle Suspension?
Info for this part was:
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.













Robert N.
2/23/2018
I have since removed this suspension enhancement system. It worked great took out the sag, prevented body roll, all it said it would do. I just could not get my 5th wheel to ride level with them because there was little to no squat. The front of the camper road high. I couldnt get it any lower with my hitch set up. More weight was thrust onto the rear axle on the 5th wheel and those two tires wore out quickly. I just dont know what caused it. Incorrect axles originally built on the camper, overloaded, or what. As I said, this system works great but I just never checked into why I had issues