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  1. Vehicle Suspension
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  3. Bump Stops
  4. Towing/Load Leveling
  5. Rear Axle Suspension Enhancement
  6. Heavy Duty
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2020 Keystone Alpine Fifth Wheel
etrailer Installation
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Timbren

Timbren Suspension Enhancement System - Severe Service - Rear Axle

Part Number: T72FR
In Stock
$269.36
Retail:$316.90
You Save: $47.54
Vehicle Suspension
Not Confirmed to Fit

2020 Keystone Alpine Fifth Wheel

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etrailer Installation
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5,000-lb Capacity hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Provides a comfortable ride by absorbing road shock and improving stability. Ideal for trucks with slide-in campers or an in-bed salt spreader. Great Prices for the best vehicle suspension from Timbren. Timbren Suspension Enhancement System - Severe Service - Rear Axle part number T72FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (965)
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  • Videos (2)
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Timbren Vehicle Suspension - T72FR

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • 5,000-lb Load Support: Keeps your truck level and steady when towing or hauling heavy gear.
  • No-Drill Frame Mounts: Bolts on easily with custom brackets for a quick, clean install.
  • Smoother Ride on Rough Roads: Hollow rubber springs absorb road shock and prevent bottoming out.
  • Better Handling and Control: Reduces sway, squat, and body roll for safer steering and braking.
  • Progressive Spring Design: Soft under light loads, stiffens automatically as weight increases.

Features to know about

Keep Your Truck Level and Confident: 5,000-lb Rear Axle Support

Heavy loads or tongue weight can make the back of your truck sag and the front end lift, throwing off steering and braking. The Timbren Suspension Enhancement System – Severe Service – Rear Axle adds solid support with 5,000-lb capacity hollow rubber springs that sit above the rear axle. They work with your factory suspension to keep the truck level when hauling gear or towing, improving handling and stability without changing the ride height or alignment.

Truck with heavy load in bed showing rear sag before installing Timbren suspension enhancement system.

Smooth Out Rough Roads: Progressive Rubber Springs Absorb Shock

The hollow rubber design cushions bumps and rough terrain so you don’t feel every jolt in the seat. The convoluted shape collapses progressively—the more weight you add, the stiffer it gets. That means a comfortable ride when empty and solid control under a heavy load. The rubber also helps take road shock off the leaf springs, protecting your factory suspension from bottoming out.

Truck driving over rough terrain demonstrating road shock absorption benefits of Timbren suspension springs.

Stay Steady in Crosswinds and Turns: Independent Spring Action

Each Timbren spring works on its own to handle side-to-side weight. When a curve or crosswind tries to push you around, the springs resist body roll and keep the truck planted. They also help when loads are off-center, keeping both sides balanced whether you’re turning into a driveway or cruising down the highway.

Illustration showing reduced body roll and sway in vehicle using Timbren suspension enhancement system.

Illustration of tow vehicle and trailer showing reduced trailer sway with Timbren suspension system installed.

Install It Once and Get to Work: No Drilling Required

This system bolts directly onto the frame with custom-fit brackets and hardware—no drilling needed. Once installed, it’s ready to go with no airlines, compressors, or gauges to maintain. The setup is simple, durable, and built for years of dependable load support with a lifetime warranty.

Specs

Weight and Capacity

  • Load-leveling capacity: 5,000 lbs

Diagram comparing loaded and unloaded vehicle suspension heights using the Timbren Suspension Enhancement System on a rear axle.

Graphic showing compression stages of a Timbren hollow rubber spring as vehicle load increases.

Warranty

  • Lifetime warranty
  • Satisfaction guarantee

TORTTNL Timbren SES with Aeon Hollow Rubber Springs - Rear Axle - Severe Service

Installation Details T72FR Installation instructions

This Product Fits The Following Vehicles




Video of Timbren Suspension Enhancement System - Severe Service - Rear Axle
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for The Low-Down on the Timbren Suspension Enhancement System

Today we're gonna be taking a look at a popular upgrade for your pickup trucks. It's the Timbren Suspension Enhancement System. All you gotta do is put your vehicle in the fit guide, just to get the kit that'll have a custom bracket so it'll fit the truck. There's a lot of different ways that you can beef up your suspension and a lot of options on our site. But I like these the best, because it literally took me maybe 15 minutes to install. So if I we're to compare this to airbags, airbags are kind of a pain, you have to run airlines you probably need a compressor.

And if you don't get a compressor, you gotta run out and air them up. They're a little bit more customizable, but you don't really have it completely dialed in. With this, the stop is exactly where it is, and as your suspension starts to sag, it'll kick in right away and there's a lot less maintenance and it's the most cost effective way to kinda beef up your suspension. So if you want my opinion, this is the way to go. So here is what we added today.

So we basically just replaced the factory bump stops. So there's a lot of different situations where we're gonna really need these. We'll notice the gap down here. We're gonna have a lot less of a gap than we did with the factory system. So, if your vehicle sags under a load whenever you have a lot of stuff in here.

You have a 450, you're planning on doing some pretty big stuff with it, so a lot of the times it'll make your headlights just go way up bright and you're blinding everybody that you're driving against. Also with less of a load on the front wheels, we are going to have a little bit less good steering and handling just because of the weight transferred to the back. So, you bought a big old truck, you're planning on doing quite a lot of heavy hauling, so this isn't going to increase our capacity of our truck. It is gonna have a limit of 12,000 pounds, but it is going to do a lot for you, what Well, a lot of that sag whenever you have a lot of load in the back, what happens is it starts going like that. One, you're gonna be that guy on the highway that everybody's flashing lights at because once your front end starts to raise, it's gonna look like high beams and you're gonna be blinding everybody.

You don't wanna be that guy, trust me. Also, whenever that weight kinda transfers to the back, there's gonna be less weight on the front. So less weight on the front, that's what steers. We're not gonna have near as good of handling as if we have these on, and it's a little bit more level to where we keep the weight kinda distributed a little bit more. Also with the leaf springs, they're gonna engage a lot quicker with the Timbren Suspension System. So your leaf springs aren't gonna be working a whole lot. It's gonna limit trailer sway and all sorts of stuff. So if you really just wanna kind of protect your truck and just make the whole riding experience a little bit nicer, it's definitely the way to go. Whether you're hauling with a ball mount, or a gooseneck or fifth wheel, it's not gonna have any interference with the gooseneck or fifth wheels in the bed of your truck. So you don't have to worry about that. Some of you guys we're wondering, and Adam's saying, it's not gonna be a problem. So one, I like the black color, 'cause it doesn't really stick out like the factory ones. And also these are a lot smaller than the ones we put on here, there's only about a finger's length in between there. So they're definitely gonna engage even with some of the lighter loads. And that'll do it for a look at the Timbren Suspension Enhancement, and I'm Adam with etrailer..

Ratings & Reviews

4.5

965 reviews
5 Stars
(717)
4 Stars
(137)
3 Stars
(29)
2 Stars
(34)
1 Star
(48)
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by:
so far so good. Installaion was easy. It raised the rear of my truck up serveral inches. My truck is always over frieghted with tools and liquids which creatated a sag in the rear end over the years. It does ride a little stiffer, which I expected. We have another truck on order and will install a set on that truck as well.
by:
by:
by:
Works well on my F250 6.75 bed with a 1700lb dry Capri Retreat camper. Solved 4" squat without airbags. Eliminated sway in high winds.
Heather A. profile picture
Etrailer Expert

Heather A.

5/26/2026

Wow, that is exactly what we love to hear about these springs! That is a serious camper. Any plans with it this summer?

by:
I have Timbrens on an F350. We have a heavy truck camper that we use multiple times a year. I've had both these and airbags on multiple rigs over the years and the Timbrens are superior by far especially because they don't leak at the connections, valves or bags or work loose. They also help with the sway.
There is no pump or electrical involved. Airbags have just too many parts and potential points of failure guaranteed to happen away from home on a muddy road. Once Timbres are installed you're done. In this case the less expensive and simpler solution is the better one!
Tom E. profile picture

Tom E.

8/9/2026

Still working great! No issues. Other than being dirty, they look and perform like new.

Jerred H. profile picture
Etrailer Expert

Jerred H.

8/9/2026

@TomE That's great to hear Tom! Thanks for coming back after a year and sharing that feedback.
by:
2012 Toyota Tundra
Time will tell! Fast and easy install on my 2012 custom flatbed tundra. Hoping this will help when I overload my truck. I have about 900 lbs of extra weight on my truck at all times + Old man Emu heavy duty leaf springs.
by:
Really won't know until I put my truck camper on the vehicle. Product looks and feels quality, we'll see about performance. Installation instructions could be a bit more detailed.
James profile picture

James

7/27/2026

So far they have been fine. They are part of my suspension upgrades, along with stable loads and sway bar. I wasnt worried about harder ride when camper off, I wanted best suspension when camper was on. I would definitely recommend them.

by:
2006 Ford F-350 Super Duty
It was tough to remove the stock bump stops on a 06 f350 the new timbrens were straight forward easy to install. They are quite expensive for what they are! I won’t be putting the slide in camper back on until spring so I really won’t know how they will perform but I hope they work as advertised.
by:
Ford F-350 Super Duty
I ran air bags on my previous trucks when pulling my 5th wheel and trailers, but these worked just as well without the expense. I run them on a F350. Great product!!!
by:
2011 Ram 1500
The installation was pretty simple and I’m sure they will work out fine, but I won’t know for sure until the next time I have to take my tractor on the trailer or load up my ATV.
by:
2023 Ford F-350 Super Duty
The Timbrens arrived and install was a breeze. Look to be of very good quality. I went with the severe duty because my truck is always loaded up with camping supplies, electric bikes tools…. The topper on back along with the slide tray are added weight. I pull a 7k travel Trailer with 650-700 pounds on hitch. The Timbrens are barely touching the axel without the trailer. I really enjoy dealing with etrailer. They answer all your questions and always put the customer first. It’s kind of like your project is their project.
Charles profile picture

Charles

2/8/2026

Excellent product. Does exactly what they were designed to do. I removed the sever duty extension. Now the ride is soft when unloaded. But yet smooth when towing or loaded heavy.

Andrew N. profile picture
Etrailer Expert

Andrew N.

2/9/2026

@Charles Nice! I'm glad you are still enjoying them. I had the timbrens on my old Nissan Titan and they did great for the 5 years they were installed for towing my car hauler. I'm curious though, when you say you removed the severe duty extension, are you meaning the rubber spacer?
Charles profile picture

Charles

2/9/2026

@AndrewN Yes sir, with the extra rubber in the ride when empty was a little rough. IMG_6417.jpeg
by:
2016 Ram 1500
They are difficult to seat. Soapy water does nothing to help. I had to spray with silicon,jack up the back of the truck and place 2x4's between the bump stop and the axle,NUMEROUS TIMES.
Once I towed my 5th wheel I noticed the difference. When unloaded, the ride is normal.
by:
Love my Timbrens. Had airbags and was tired of leaks and the need to adjust air pressure. Easy to install!
by:
It would be helpful if the kit contained all the hardware to attach it to the truck. I purchased this to replace a Loadlifter 5000 that was installed 9 years ago. I don’t have the OEM clip and nuts that goes into the frame. It took hours of searching before I finally figured out I could find it on the Ford suspension schematics.
by:
Ram 3500
Do not keep vehicle level. 800 Lb. tongue weight trail still lowers rear of truck approximately 4 inches. 3500 GMC Dually 4x4

My advice is don't be lazy just go with air bags.

They say satisfaction guaranteed defiantly not satisfied and will be less than happy if they charge me a restocking fee on a bad product. I should have known better.
by:
My truck has an added utility body in the bed at all times. Before addinng the Enhancement System I did not feel that I had control of the truck. After adding the system the truck drives much easier and has a "safter" fee.
by:
2026 Ford F-550 Cab and Chassis
Quality product, I have owned Timbrens before. They work good. Installation is fairly easy depending on your skill level. Etrailer as always - great!
by:
2025 Ford F-450 Super Duty
The reality of how long it took to install was misrepresented. I am 74 years old and my wife and I installed these bump stops in about a 2 hour span including rest time. We actually expected that. The results were as promised and I truly appreciate that.
by:
Awesome. They work great. I’m glad I chose this path versus airbags.
Scott profile picture

Scott

5/9/2026

They work great and are holding up well after a year in service on my 2011 F350 SRW hauling my Lance 855 truck camper.

by:
Dodge Ram Pickup
Works very well on my Ram 3500 long box 4x4. Really helped with stability pulling a 2600# tongue weight, 16K Gvw 5th wheel. Super easy install!
Loren profile picture

Loren

3/6/2026

No changes, zero issues or regrets!

by:
Package arrived and pretty beat up from shipping, everything was there except the hardware. I sent etrailer an email and Joy T. replied back quickly, got hardware in the mail and I installed today. Great service and quick response!
by:
2006 Chevrolet Silverado
This review is on a timbren air spring ,I bought this on a Saturday night ,went out of town Monday morning and got in on Thursday afternoon ,wife said the box had arrived Tuesday and put them on this morning on our 2006 Chevy k-3500 ,my guy had the truck in our shop for an oil change and I asked him to put it on, came back 45 min later and he was done with the spring installation and the oil change ! I asked him how hard it was and he said it took him longer to figure out which parts in the kit he needed that the actual install ,said it was about as easy as it gets .Well ,now for the test drive we drove the truck empty ,pretty much as stock ,rode real well.Then we put a Gaylord box that weighed 4506# and drove the truck ,WoW ,What a difference ,truck rode great and handled well ,went over railroad tracks,really handled well and rode great ,I wish I'd have done this years ago ! I highly recommend this product and commend etrailer on their good service and what made me decide to purchase the timbren product was the you-tube video ,after I saw that ,I placed the order ,it looked so simple to install and it went on just like on you-tube
Bryan L. profile picture

Bryan L.

12/11/2017

The air springs have performed flawlessly ,very pleased with the product and performance ! As a matter fact I was recommending this product to a friend the other day.

by:
2014 Ford F-350 Super Duty
Great product,used on 2014 f350 with arctic fox 990,leveled it out,no rear sag
by:
I have a 2300 pound truck camper. I drove before the Timbrens and after. Felt like a completely different truck after. Felt as good as my old truck with airbags for half the price.
by:
Ford F-350 Super Duty
Ended up contacting Timbren to get extra disc to get proper distance to axle housing for my 2022 F350. They sent me 2 free discs. Installing was easy. I've towed my very heavy tongue weighted unit a few times since and have been satisfied with Timbren keeping rear of truck up and level. When not towing, Timbren is off axle housing and regular suspension is used.
Eduard profile picture

Eduard

12/11/2025

Great! After 20,0000 miles, Timbren Still keeps my truck Level and stable towing heavy loads.

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See what our Experts say about this Timbren Vehicle Suspension

  • Jounce Bumper Helper Spring Options for 2021 Toyota Tacoma
    Some 2021 Tacoma were equipped with 3 leaves in the springs, some with 4, so you'd just need to take a quick peek at what you have to determine which Timbren kit you'll need, as I have no way to look up how your truck is equipped. For a 4WD with 4 leaves in the spring pack, use # TTORTUN4, for 3 leaves use # T72FR. For 2WD vehicles with 4 leaves, use # T62FR or # T72FR for 3 leaves. This being said, the Timbren systems offer much more support than what you'd actually need to counteract...
    view full answer...
  • Comparing Timbren Kits for 2022 Toyota Tacoma
    There is an interesting amount of Timbren kits that fit your 2022 Toyota Tacoma long bed. The part # TABSTRFK is a standard duty kit that comes with a U-bolt flip kit helps with ground clearance. # T72FR is a severe service kit for 3 leaf springs which means it's going to be really harsh, # T62FR is same thing but for 4 leaf spring packs. # TABSOSR is a standard duty kit which means it'll give best blend of support and ride quality. This would be what I would recommend.
    view full answer...
  • Heights of 2016 Toyota Tacoma Timbren Severe Service Suspension Enhancement Kits
    Here are the heights of the Timbren Severe Service kits for your 2016 Toyota Tacoma: - Timbren Suspension Enhancement System # T72FR - Total Height 4-7/16" - Rubber Spring 3-9/16" - Timbren Suspension Enhancement System # T62FR - Total Height 4-7/8" - Rubber Spring 3-9/16" I confirmed all of this with my contact at Timbren.
    view full answer...

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Info for this part was:

Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video by:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee Michael B
Updated by:
Michael B
Employee Carrie F
Updated by:
Carrie F
Employee Lincoln B
Updated by:
Lincoln B
Employee Daron K
Edited by:
Daron K
Employee Alex H
Written by:
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Employee Bradley B
Installed by:
Bradley B

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