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Heavy trailers and bed loads can make the rear of your vehicle sag and throw off steering and braking. The Timbren Rear Suspension Enhancement System adds up to 3,600 lbs of extra support above the rear axle to keep things level and stable. The hollow rubber springs sit just an inch above the axle, letting your factory suspension work normally when empty, then firming up automatically as weight is added. That means less squat, better control, and a confident ride when towing or hauling heavy gear.
When the road gets rough, these Aeon hollow rubber springs act like built-in shock absorbers. They cushion bumps and dips so your ride stays comfortable even when loaded. The progressive design collapses along the folds under pressure, then stiffens as weight increases, giving you a smooth transition from soft to firm support. This helps protect your suspension from bottoming out while keeping the ride steady and controlled on uneven pavement or gravel.
Each Timbren spring works on its own to support the driver or passenger side only when needed. That independent action cuts down on body roll during sharp turns and helps keep off-center loads balanced. When a semi passes or a gust of wind hits your trailer, these springs help keep both the truck and trailer tracking straight so you stay in control through corners and highway turbulence.
Adding load support doesn’t have to be complicated. The Timbren system includes 2 Aeon hollow rubber springs with vehicle-specific brackets and hardware that bolt right in place of factory bump stops. No drilling is required, so you can install it with basic tools in your own driveway. Once mounted, there are no airlines or adjustments to fuss with—just reliable, automatic support that keeps your vehicle level every time you load up or hitch a trailer.
Customer Satisfaction Score:
85% were satisfied with this product
15% of customers were not satisfied
Ratings & Reviews
Gwendolyn Y.
3/26/2026
Hey, Keenan. I'm sorry to hear how your ride quality is with the Timbrens. That is one downside to them, unless your under a constant load, it can affect your unloaded ride. Are you just towing the enclosed trailer or are you towing/hauling any other type of equipment?
Mark
8/30/2019
Fantastic, I ordered a second set for another truck I own. They set above the axle so when not loaded there is not a stiff ride.
Meredith M.
2/12/2021
Still love them, wouldnt travel without them.
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.
Gwendolyn Y.
5/21/2026
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!
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Terry F.
4/10/2019
After 1 year they are doing exactly what was expected of them. A great product with great results. I will and have recommended etrailer to many people because of the quality products and fantastic service and followup.