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Heavy trailers and loaded beds can drag your rear end down, throwing off steering and braking. The Timbren Suspension Enhancement System adds 11,000 lbs of rear axle support to keep your truck level and stable under serious weight. Whether you’re pulling a camper or hauling lumber, it reduces sag so your ride stays controlled and predictable.
Bumpy roads and rough terrain can make towing or hauling feel harsh. These hollow rubber springs absorb shock and vibration before it reaches the cab. They cushion the bumps, helping protect your suspension from wear while keeping the ride smoother for you and steadier for your trailer.
When weight shifts or loads aren’t even, these springs work independently to balance each side of your truck. That independent action helps control body roll in turns and keeps things steady when crosswinds or curves try to push you around. The result is a more confident, planted feel behind the wheel.
Unlike airbags that need compressors, hoses, and pressure checks, these rubber springs do their job on their own. Once installed, they don’t need adjustments or upkeep—just consistent support every time you tow or haul. It’s a straightforward way to add stability without adding maintenance hassles.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi everybody, Andy here with etrailer. Let's take a quick look at this Timbren rear axle suspension enhancement system. Now this kit has been designed to fit your 2007 to 2009 Dodge Sprinter 3,500, and then your 2007 to 2015 Freightliner Sprinter 3,500, and then your 2010 to 2015 Mercedes-Benz Sprinter 3,500. And then finally your 2016 and newer freightliner and Mercedes-Benz Sprinter 3,500, both the two wheel and four wheel drive models. Now on custom fit parts such as this custom suspension enhancement system, I do recommend taking advantage of our vehicle fit guide here at etrailer. Simply input the year, make, and model of your vehicle and answer any questions that it might have for you.
And our fit guide will confirm if this will work for you or if we have something comparable that will work for you. So these hollow rubber springs with an 11,000 pound capacity are going to mount to existing attachment points on your sprinter to give you strong rear axle support to help reduce sag and improve handling. These springs also give you additional support as needed, so you always have a smooth, comfortable ride allowing the leaf spring ample movement while cushioning light loads. They're going to ride just as smoothly when you're not hauling the load and they become more rigid as more weight is added for great performance when you're hauling a heavy load, increasing stability and reducing vehicle sag. They do work independently, adjusting side to side, helping to compensate for off-center loads and reducing body roll when swerving and turning corners.
And these springs also act as shock absorbers, taking the brunt of bumps and rough roads, extending the life of your vehicle suspension. So this kit includes everything that you see here. As you can see, I do have them just kind of stacked as they're going to be assembled. I don't have hardware holding anything together here, but I just kind of wanted to give you an idea of what this is going to look like. And you have spacers here, and depending on your particular setup on your sprinter, you may need one of the spacers.
You may not, but the instructions are included here and they're gonna tell you which way to go, whichever is going to work best for you. But everything that you see here is included. And again, the capacity that this gives you is up to 11,000 pounds. But it is important to note that these springs do not actually increase your sprinter's weight carrying capacity. So you wanna make sure that you're not exceeding your manufacturer's recommended weight limit.
If you happen to have any other questions, whether it's about this system or anything else that we have here at etrailer, don't hesitate to reach out because ultimately we do wanna make sure that you're getting exactly what you need. Well, again, my name is Andy. Thanks for joining me.
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
Ratings & Reviews
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!
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
With the Timbrens, you will want to have a 1/2" to 1-1/2" gap when the vehicle is unloaded. They are only designed to engage when the suspension is under load and you need the additional support. If you want to reduce that gap so the Timbrens engage sooner, you can add the 1/2" Spacer # TA25722-90P00 or the 1" Spacer # A25723-90AH00.
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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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!