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When you’re towing or hauling heavy gear, it’s easy for the rear end to sag and the steering to feel light. The Timbren Rear Suspension Enhancement System adds up to 8,600 lbs of extra support right above the rear axle, keeping your vehicle level and steady under weight. The hollow Aeon rubber springs work with your stock suspension to improve handling, braking, and ride comfort while eliminating squat and body rise so your trailer tracks straight and safe.

Bumpy roads and uneven loads can make a truck bounce and jar. These hollow rubber springs compress progressively—the folds collapse first for a soft start, then firm up as weight increases. That means smooth cushioning over light bumps and solid support when you’re loaded down. The rubber also absorbs road shock to prevent bottoming out and reduce wear on your factory suspension over time.

When a curve or crosswind tries to push your rig around, each Timbren spring acts on its own to keep that side planted. This independent movement cuts down on body roll when cornering and keeps sway in check if a passing semi or gust hits your trailer. Even with off-center loads, the system evens things out so you stay stable and in control.


You don’t need air lines, compressors, or complicated hookups to get heavy-duty support. The Timbren kit bolts onto the frame rails above the axle using included brackets and hardware—no drilling required. Once installed, you get instant load leveling and stability without needing to adjust or maintain air pressure, just pure mechanical support that’s ready whenever you tow or haul.


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hello everybody, this is Jeff at etrailer.com. Today, we're gonna take a look at this Timbren Rear Suspension Enhancement System. Now, this is a custom fit part. It is designed to fit the 2002 to 2019 Ford F-53 chassis vehicles. And on a custom fit part like this one, I do recommend for you to go to our website, use the fit guide, putting your year and model vehicle, and it'll show you if this will work for your application. Now these parts here will improve the suspension, the handling and safety of your vehicle.
These do provide additional support as needed. So you always have a nice, smooth, comfortable ride. Basically, it allows the leaf spring ample movement while cushioning any light loads. And it does not affect the empty ride of the vehicle. Basically, it'll become more rigid as more weight is added.
It increases stability, provides great performance while hauling heavy loads. And it'll even reduce vehicle sag. And what's nice with these is they do work independently side to side. They'll help compensate for any off-center loads. They do reduce body roll when you're swerving or turning corners.
And they'll actually act as shock absorbers also, taking the brunt of the bumps in rough roads. This does extend the life of your vehicle suspension. Now it does include these two AE-on hollow rubber springs, all the vehicle-specific mounting brackets with the hardware, even a nice set of instructions that describes how everything goes together. And when you do install these, these do replace the axle bump stops on the frame. There's no drilling required.
A few specs on this, the capacity on this kit is 8,600 pounds. Now the Timbren Springs will not increase your vehicle's weight carrying capacity. So you do always wanna make sure not to exceed the manufacturer's recommended weight limit. And this is designed to work with a suspension system that is in good working order. But that's gonna do it for the review on this Timbren Rear Suspension Enhancement System.
Customer Satisfaction Score:
79% were satisfied with this product
21% of customers were not satisfied
Ratings & Reviews

Cherie
2/12/2025
The product works great. It really helps my motorhome from rocking back and forth. I am very satisfied.


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?

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!
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Lazer S.
3/10/2026
Sorry to hear that, Paul. What specifically are you wanting this for? This is designed to fit an F-53 frame from 2002 to 2019, but there are some fits/exclusions for specific RV manufacturers. If you can let me know the year, make, and model I can see what we have that will work for you.