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A loaded bed or heavy trailer can make the back of your vehicle sag and the front rise. The Timbren Rear Suspension Enhancement System adds up to 6,000 lbs of extra support with hollow rubber springs that mount above the rear axle. They work with your factory suspension to keep things level and maintain traction, steering, and braking under load. No air hoses or adjustments needed—just steady performance whenever you haul gear or tow a trailer.
Uneven pavement and bumps can beat up your suspension when you're carrying weight. These Aeon hollow rubber springs act like cushions, taking the brunt of each bump and reducing road shock before it reaches the cab. That means a smoother, more stable ride and less wear on your leaf springs over time. Even when loaded, the extra elasticity of rubber helps keep ride quality comfortable.
When a curve or strong gust tries to push you around, each spring works on its own side to keep the vehicle planted. This independent action cuts down body roll and sway so you stay in control through corners or when hauling off-center loads. It also helps calm trailer movement since less turbulence gets passed back from the tow vehicle.
Getting extra support doesn’t have to mean a full shop teardown. The kit includes vehicle-specific brackets and hardware that bolt to existing frame points—no drilling required. Once installed, there’s about an inch of clearance above the axle so your stock suspension still handles light loads normally. It’s an easy upgrade that adds serious stability without complicating your setup.
Customer Satisfaction Score:
95% were satisfied with this product
5% of customers were not satisfied
Ratings & Reviews
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.
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!
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
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!
Kate F.
5/6/2026
Glad we had the right suspension upgrade to help with the squat Dennis! How is the ride when you are unloaded?
Kate F.
8/31/2026
I am happy to see we had some suspension support for you Benjamin! What kind of trailer are you towing?
Heather A.
2/21/2025
Timbrens are the best for sag because they are made of dense rubber. 6500 lbs sounds like one heck of a travel trailer, what is it? Any fun plans this summer?
Jerome
3/2/2026
Awesome product. Would recommend.
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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.