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When you’re hauling a heavy load or towing a trailer, rear-end sag throws off handling and headlight aim. The Timbren Suspension Enhancement System adds up to 2,400 lbs of load-leveling support to keep your vehicle level and steady. Its hollow rubber springs work with your factory suspension to reduce squat and maintain control under load—no air lines, compressors, or adjustments needed.

Rough pavement and potholes can beat up your suspension. Timbren’s Aeon hollow rubber springs absorb road shock and cushion bumps so you get a smoother, more stable ride when loaded. The progressive spring rate means they stay soft when lightly loaded and get firmer as weight increases, taking the brunt of impacts before they reach the frame or cargo.



Heavy loads or off-center cargo can make your truck lean through corners or sway on the highway. Each Timbren spring works independently to keep your vehicle balanced side to side. This design helps cut down on body roll when turning or swerving and keeps trailer sway from transferring back into the vehicle for better control on the open road.


Adding rear support doesn’t need to be complicated. The Timbren system bolts directly onto the frame using custom-fit brackets, spacers, and included hardware—no drilling required. Once mounted, the springs automatically engage as the load increases, giving you reliable suspension support without any manual setup or maintenance.
Customer Satisfaction Score:
92% were satisfied with this product
8% of customers were not satisfied
Ratings & Reviews

Phil S.
8/21/2021
Simple, easy install, works great.

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

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!

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.
4/2/2026
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?
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Philip
12/9/2022
Great,