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  1. Vehicle Suspension
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RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty

RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty

Item # RAS34FR
Our Price: $589.00
Vehicle Suspension

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Shipping Weight: 30 lbs
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3,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway. Great Prices for the best vehicle suspension from RAS. RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty part number RAS34FR can be ordered online at or call 1-800-940-8924 for expert service.
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RAS Vehicle Suspension - RAS34FR

  • Leaf Springs
  • Rear Axle Suspension Enhancement
  • Heavy Duty
  • RAS

3,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.


  • Heavy-duty custom kit converts your vehicle's factory leaf springs into a mechanically active suspension system
    • Actively strengthens leaf springs for improved ride quality with or without a load
  • All-in-one suspension system improves stability, handling, and control
    • Eliminates axle wrap, wheel hop, and bottoming out
    • Reduces dangerous sway and body roll while cornering
    • Keeps your ride level when towing or hauling a heavy load
    • Improves traction while breaking and accelerating
  • Variable-rated coil tension springs automatically adjust to your vehicle's load
    • Activate immediately to support the extra weight
    • Disengage when unloaded, allowing your leaf springs to perform as intended
  • Customizable coil springs can be adjusted during installation to accommodate your towing or hauling needs
    • Independently adjustable for side-to-side leveling of off-center loads
  • Helps extend the life of leaf springs, shock absorbers, shackles, and even tires
  • Durable, epoxy e-coated steel construction
    • Corrosion-resistant brackets on the ends of each unit have a salt spray rating of more than 800 hours
  • Easy, bolt-on installation - no drilling, cutting, or welding required
    • Unit secures under the leaf spring and around the factory U-bolts
    • Fully assembled kit and hardware are included
  • Maintenance-free - adjustments and monitoring aren't needed once installed
  • Made in the USA


  • Weight capacity: 3,000 lbs
    • RoadActive Suspension will not increase your vehicle's weight-carrying capacity
  • 5-Year warranty
  • 30-Day money-back guarantee

All-In-One Suspension System

When towing or hauling a heavy load, you may encounter a number of problems that can make your driving experience difficult or dangerous, such as sway, body roll, or bottoming out. When your vehicle is weighted down, your factory leaf springs can't counteract these problems to the extent that they are supposed to. The weight will overpower the leaf springs and cause them to twist or flatten out. When that happens, they cannot support, level, or stabilize your vehicle effectively. Additionally, because your factory leaf springs are passive, they won't begin to tackle problems such as sway until those problems have already started.

Diagram of RAS Installed

RoadActive Suspension (RAS) kits enhance those passive leaf springs by converting them into a mechanically active, all-in-one suspension system. RAS kits have variable-rated coil tension springs that automatically adjust to your heavy load. Other suspension systems only solve a few problems and usually at the expense of other improvements your factory leaf springs may need. RAS, on the other hand, is a unique kit that provides everything you want in a suspension system without any trade-offs. It eliminates bottoming out like air springs, reduces sway and body roll like sway bars, keeps your ride level like helper springs, and improves traction and braking control like traction bars. This improves your vehicle's stability, handling, and control while you are towing or hauling, as well as when your vehicle is unloaded. RAS also makes your overall driving and towing experience safer and more comfortable, which greatly lessens driver fatigue.

How RAS Works

Close-Up of RAS Tension Spring

Each RAS unit has a powerful variable-rated coil tension spring that converts your passive leaf spring into a mechanically-active system. Once your vehicle is loaded, the tension springs immediately activate to absorb and support the weight. This allows your leaf springs to maintain their bowed position and keeps them from flattening out or flipping over, which greatly hinders their ability to bear a heavy load. The tension springs are variable-rated, which means that the heavier your load is, the more assistance they provide to your leaf springs. Because of this design, RAS reacts instantaneously, whereas hydraulics, air springs, and other suspension systems take time to react. And unlike your factory leaf springs, RAS stops sway and sag before they even start to happen. Additionally, when your vehicle is unloaded, the tension springs disengage, allowing your leaf springs to perform as intended without hardening your ride. RAS won't hinder your leaf springs' movement, nor will it cause any friction between any of the brackets.

Eliminates Axle Wrap and Wheel Hop

RAS Eliminates Axle Wrap

When under a heavy load, leaf springs are especially susceptible to axle wrap, which can cause wheel hop. Wheel hop is when the tires lose their grip on the road, causing a jarring, up-and-down movement. Axle wrap occurs when the circular motion of the tires cause the leaf springs to twist or rotate. If the leaf springs twist far enough, wheel hop can occur. RAS stabilizes your leaf springs by absorbing the force of the load they're trying to support. This eliminates axle wrap and wheel hop, as well as prevents your vehicle from bottoming out. Because of this, less strain is put on your vehicle. And by reducing some of this wear and tear, RAS helps extend the life of your leaf springs, shock absorbers, shackles, and even tires.

Reduces Sway and Body Roll

RAS eliminates sway and body roll

When driving along a curve while towing or hauling a heavy load, the back end of your vehicle or trailer can start to shift with that weight. If your factory leaf springs have flattened or twisted under this load, they won't be able to prevent it from shifting. Because of this, your trailer will sway away from your vehicle. This makes driving challenging and dangerous, as it increases the risk of body roll, which is when your vehicle drastically leans to one side. This can often cause you to completely lose control of your vehicle. Body roll is especially prevalent with multi-passenger vans and vehicles towing long campers, trailers, or boats. RAS provides a much safer ride by reinforcing your factory leaf springs and stabilizing your load. This helps prevent sway from occurring and reduces the chance of body roll while cornering, turning, and swerving. RAS also lessens the rocking motion that happens during windy conditions or when a semi passes by on the road.

Levels Your Ride and Improves Traction

RAS Levels Your Ride

When your vehicle is overloaded, the bulk of the weight transfers to the rear axle. Your factory leaf springs then become overwhelmed by this weight, as they are not strong enough to support it. This causes the back end of your vehicle to sag and the front end to rise, which means that the front tires have lost some of the grip they need with the road. In addition to loss of traction, it can also cause poor headlight aim, unintentional swerving, and an extremely bumpy and uncomfortable ride. RAS bolsters your factory leaf springs and enables them to provide support for your load without compromising ride quality or comfort. This keeps your ride level from front to back whether you are hauling a load in the bed or towing a boat, trailer, or camper. RAS also ensures that your tires have the traction they require while braking and accelerating, which improves the overall driving experience.

Customizable Coil Tension Springs

Adjusting Spring With Spacer

RAS is also customizable. During installation, the coil tension springs can be adjusted to 2 different tension settings or anywhere in between for improved road handling and support. To do this, rotate the springs while keeping the threaded rod still. As you turn the spring, use one of the 2 included spacers as a gauge to measure the widening gaps between the coils. In order for the RAS units to work as intended, you must tension the coils to a minimum of 25 percent with the 1mm white spacer and no more than 40 percent with the 2mm spacer. The springs can also be independently adjusted to compensate for off-center loads such as a handicap lift.

Easy, Bolt-On Installation

RAS Once Installed

This custom-fit kit comes fully assembled and is easy to install. Each RAS unit simply bolts onto your factory leaf spring with the included hardware, and drilling, welding, and cutting aren't required. First, position the eye hook bracket so that it wraps around the top of the factory leaf spring eye. Then the axle bracket secures under the leaf spring and around the factory U-bolts on the other side of the leaf spring pack. Once the maintenance-free RAS units are fully installed, you won't need to monitor them as you would with air springs.

Corrosion-Resistant Steel Construction

RAS Construction Close-Up

RAS is extremely durable and corrosion-resistant. The units are constructed of high-grade alloy steel, and they have an epoxy e-coat on the coil springs to provide extreme corrosion resistance. The brackets on the ends of each unit resist the effects of water and other elements, and they have a salt spray rating of more than 800 hours.

4611-TDHD RAS Custom HD Active Suspension System for OEM Leaf Springs - Rear Axle

Installation Details RAS34FR Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty - RAS34FR

Average Customer Rating:  4.8 out of 5 stars   (57 Customer Reviews)

3,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.


My third set. F-110, F-250 and a Tundra. I use the F-250 to pull a 42’ Fifth Wheel RV. 2300 Lbs.tongue weight. Barely lowers the truck compared to without the enhancement kit. It feels like 300 Lbs. Still have a great ride when not towing and without a load.

Toyota Tundra

I own a Toyota Tundra what suffers from the famous "Toyota Sag". After much research, I landed on the RoadActive Suspension. I considered a simpler solution (think bump stop), but I had that on a previous truck and I wasn't fully satisfied with the outcome for the investment. The package arrived on time and in good condition. The kit looks very sturdy and seems like it will be easy to install. I'm planning on installing it this weekend. Time will tell.


Added these to my 2016 Tundra in preparation for towing my 24 foot travel trailer around the country. 15 states and who knows how many miles I am so happy with them. I don’t have a distribution hitch and the truck tows so well. Without the trailer bumpy roads aren’t harsher than before, and there’s a minor improvement to handling.

So glad I didn’t get air bags and got these instead.

2018 Toyota Tundra

Etrailer was very helpful on the ordering and shipping of the RAS suspension assist.
I have not installed yet that will be completed tomorrow, will write a follow up in a few weeks. Pictures 9f install will be added at next review.



Great, the RAS has worked just as they describe. A more stable ride while pulling the camper, smoother while hauling a payload. Very pleased with the product


Easy to install. Provided the extra lift I needed when towing yet very little change in roughness when not towing.



This product was a great choice. After a month or so I adjusted the spring tension and now it just does its job without any maintenance or inspection as needed with air bags. Very happy with this choice!


Stiffened up the rear of the truck considerably. Minimized trailer drop when hauling my camper, and has improved the ride stability when hauling around dirt and rocks. No more tire squish or taking it easy for this Toy. Excellent product, well designed, and easy to install on the driveway.



Still working wonderfully. No sag, rear sticks to the road when cornering, can hardly tell when youve got a load or are towing a trailer. Even pulled my buddys 28 Cougar trailer with no issues. Excellent product, and love the adjustments.


I just finished installing this kit and the installation was very simple and smooth. I did take it for a no-load test run, and could tell the change. Can't wait to see how it does with a load, (my Quad).



This a great product, it truly helps the suspension of my truck, both with or without a great!

Toyota Tundra

Good quality, easy to install. A great addition to our Toyota Tundra.

2017 Toyota Tundra

Delivery a day early, install in less than two hours. Raise rear end of truck 1" at fender well and 1.5" at hitch. Will follow up after pulling a 6500 lb boat and trailer.


RAS has worked well on the Tundra towing a 27ft Airstream GT.

2017 Toyota Tundra

Well worth the money installed it on my 2017 Tundra when I’m not towing I can’t tell they are on when I’m towing makes a huge difference I have them in addition to a set of timbren bump stop on my rear suspension they compliment each other great when towing highly recommend both.

Pontiac Trans Sport Van

When I ordered this, I was moving some 300 bricks 90 miles. When I first got the bricks, it didn't take too many any the bed of my truck before it was hitting bottom. So after transporting them to my place 1st, I decided to find helper springs. This set I decided on, although was a bit more than I wanted to spend, I am glad I did. They were super easy to install myself in under an hour. Was able to transport more bricks in one trip vs several trips when I 1st got them. I would recommend this type of spring support to anyone. Theyvdobraose the back up a tad, but that is to be expected.

Toyota Tundra

This product did exactly what we wanted. Our Toyota Tundra suspension was lacking and sagged; this product brought the truck back to no sag while pulling our travel trailer.

2018 Toyota Tundra

Completely eliminated the sag om my 2018 Tundra. I was well within my payload and towing capacity before installing these. Now pulling level.

2014 Toyota Tundra

Just completed a 900 mile trip towing my 26 ft travel trailer with a 2014 Tundra. The RA suspension kit made a noticeable difference in the feel of the vehicle while towing with less vehicle sag. I adjusted the kit to the lower of the two settings and notice little difference in ride when unloaded. The truck does set an 1 1/2” higher in the rear. I also use an equalizer hitch w/sway control while towing. The kit performs as advertised and was not terribly difficult to install.


The system is working great. I feel my truck rides smoother.



One year later and the system is holding up well. I still feel the ride is smother. When I tow my RV I can tell a difference in the ride and the rear end does not squat like it use to.

2021 Toyota Tundra

Was very easy to install on my 2021 Toyota Tundra , I cant wait to see how it does when I haul a Heavy load.
Lifted the rear up an inch.
Drives even smoother than it already did.


I like the look as well the service it does keeping my boat trailer level


Install went smooth, hooked it up and it made a difference to my overland rig when fully geard up . Even kept the articulation in the rear.


I pull a enclosed trailer with two zero turn mowers so I needed something to help beef up the suspension of my truck. I purchased the Roadmaster Active Suspension and I am very pleased with the way it helped to level my truck while hooked up to the trailer.

2019 Toyota Tundra

Added a Roadmaster Active Suspension Kit to my 2019 Tundra to reduce squat when towing my Travel Trailer with the fresh water tank full. The extra 400 lbs of water adds a lot of tongue weight. My experience with e-trailer is that they always ship “freaky fast”. As usual, my order was at my door in just a few days. The Roadmaster Active Suspension kit was nicely packaged with very good instructions. All components were well designed and manufactured. Installation went smoothly.



When originally installed, I adjusted these to the highest setting. That was more than I really needed. Backed it down to the lower setting. I get all the ride height control I need along with a better ride. Body roll, axle wrap and all the other unsettling gyrations are eliminated. Buy these, put em on and forget em.

2013 Toyota Tundra

Wow....What a difference! First off, the etrailer crew was fantastic and my order arrived a couple days early. The wife and I were scheduled to go camping the week following Thanksgiving and I wanted to install the RAS before we left so I could see if it lived up to the hype. It arrived the day before Thanksgiving while I was at work which gave me 2 days to attempt to install these on my 2013 Toyota Tundra. It took approximately 90 minutes to install......And I'm very meticulous about these things!! I had a little hiccup trying to extend the threaded rod, but etrailer support set me straight - On Thanksgiving!!! I took the beast out for a test drive and was amazed at the difference in the ride. I set them at 45% or the 2mm disk spacing and my truck rode like it was on rails. No more sway or body roll, even my wife noticed the difference! She said "I don't have to grab the Oh Sh!t handles anymore!" 2 days later we loaded up our travel trailer, a 30' trailer that weights about 8,000 lbs, and took off. The ride was sooooo much better. Very little sway from passing trucks, it was less bouncy, and we handled the corners much better. I highly recommend this product!

Michael B.


So far, so good. Still loving this product


This suspension add on makes a world of a difference when towing!! If you are in the market to upgrade your suspension don’t hesitate just go ahead and buy these things. Install took me just under one hour.


Super easy to install and love the way our truck can haul our single car hauler!!


Installed RAS34FR on 2016 Tundra 2WD used to tow an RV Trailer with an 800 lb tongue weight (truck rated for 1000 lb). The Blue Ox hitch system we use sets ball behind rear bumper about 14" putting significant leverage disadvantage on truck, and even with weight distribution set up pretty high, truck rear squats way too much.

I really like the RAS system for many reasons including: relatively easy installation, less hassle once installed compared to air bags, minimal impact on truck ride loaded and/or unloaded, expect system to be durable over the long haul, no need to fuss with pressure adjustments of air bags, and ability to easily "self tune" amount of added support in unlikely event you may choose to alter it.

I will continue using system in towing our 4 ton RV trailer as well as doing typical home owner hauling. The RAS system ( the 3000 lb capacity option) set up for 40% assist has made a world of difference towing the RV. Truck now sets level even without heavy torque set on bars of Blue Ox hitch. Handling is back to normal; no sway, front of truck elevation neutral VS pitched upward, ride is good.

Please note that at the initial set up listed above, truck does set up about 1-1/2" higher when empty and ride is just a bit more stiff compared to stock (no RAS) ride. I may choose to back down on 40% assist level a bit in future to resolve these issues which are minor in my judgement.

etrailer service from Christina J was excellent. Shipping was trouble free and prompt. Communications were timely and to the point. Although the RAS price is high, overall I feel that I got what I paid for - a product that delivers the performance it brags about. eTrailer listing was accurate and helpful. It appears the RAS product reviews are legitimate VS the obvious fake ones you get on some other popular sites.

I recommend the RAS product and feel potential buyers can trust it will deliver within it's specifications for you.

Show More Reviews

See what our Experts say about this RAS Vehicle Suspension

  • Helper Spring Recommendation For Rear End Sag While Towing With 2021 Toyota Tundra TRD PRO
    If the vehicle still squats even when using weight distribution, my first suspicion would be that the weight distribution system hasn't been set up correctly or the system being used is under-rated for the travel trailer's tongue weight + the weight of anything that's carried in the truck bed behind the rear axle. I'd suggest revisiting the initial setup to ensure things have been set up correctly. I'd also recommend confirming the the travel trailers fully loaded and ready to tow tongue...
    view full answer...
  • What RoadActive Leaf Spring Enhancement do You Recommend to Eliminate Bouncing on My 2011 Tundra?
    The RoadActive Suspension Custom Leaf Springs definitely add tightness and stability to your setup. If you do a lot of hauling, your OEM springs and shocks can use some extra support to make up for the normal wear/tear on your 2011 Toyota Tundra. Since you are hauling a 7500-pound travel trailer, I recommend using the heavy duty model # RAS34FR. The great thing about this kit is that it does add firmness to your setup while you are towing as well as when you are not towing. Also, once the...
    view full answer...
  • Best Suspension Enhancement System for a 2021 Toyota Tundra For a Self-Install
    I have a great suspension enhancement system that you can install on your 2021 Toyota Tundra. The RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS34FR is going to be a great option to improve your vehicle's stability, handling, and control while you are towing or hauling, as well as when your vehicle is unloaded. This custom-fit kit comes fully assembled and is easy to install. Each RAS unit simply bolts onto your factory leaf spring with the included hardware, and drilling,...
    view full answer...
  • Will the RoadActive Suspension System Lift the Bed of an Already Lifted Truck
    The RoadActive Suspension system # RAS34FR effects the suspension, so it will work with any body lift that you may have in place. The RAS system will lift the rear of the vehicle approximately 1" to 1-3/4" depending on the truck, so the bed is also going to raise up in the process that same amount- so it's going to be in addition to whatever body lift has already been added.
    view full answer...
  • How is the RAS System Different From Add-A-Leaf System for 2001 Toyota Tundra
    An Add-A-Leaf kit differs from the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS34FR for your 2001 Toyota Tundra in that the Add-A-Leaf is literally just adding another leaf spring to your spring stack to help make it a little more robust where the RAS system is a little more "smart". It has a spring that helps to provide constant tension and you can adjust it some for more of a relaxed or stiffer ride quality. So instead of just making your leaf spring stack thicker...
    view full answer...
  • Do I Have To Remove The Leaf Spring Eye Bolt To Install?
    That's a good question. I have seen videos of this product installed and many times the (part C) eye bracket hook just lays onto the leaf spring eye. However, since 2008 the Tundra's have required one side of the eye hook to be removed. I have attached the install procedure PDF file. Step 6 reads, "Remove one side and place it on top of the rear leaf spring eye bracket hook." They certainly could have provided a picture illustrating this and a better explanation. So yes, you do have...
    view full answer...
  • Will The RAS Suspension Enhancement System Work On A 2019 Toyota Tundra With Icon Leaf Springs
    Hi Tim, Yes, the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS34FR would still work with your Icon aftermarket leaf springs. This system simply clamps to the leaf spring stack at the center and the opposite side eyelet to act as an extra leaf spring on the stack and provide more support for heavy loads.
    view full answer...
  • Can I use a RoadActive Suspension Kit and a Timbren System on a 2021 Tundra
    I recommend using just the RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty item # RAS34FR and making sure it is adjusted properly. Yes, those 2 systems can both be installed on your 2021 Toyota Tundra. However, both of them combined would be a stiff uncomfortable ride.
    view full answer...
  • What Suspension Enhancement do You Recommend for My 2021 Toyota Tundra While Hauling Often?
    Since you haul pretty often on your 2021 Toyota Tundra, a great overall suspension option is the RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS34FR. Not only will this enhancement kit prolong the general life on your factory springs, they also don't require any additional maintenance once installed on your vehicle. The great thing about the RoadActive kit is that it eliminates axle wrap, wheel hop, and bottoming out. Also, it helps with vehicle sag if that is something you...
    view full answer...
  • Will the RoadActive Suspension for a 2017 Toyota Tundra Affect Payload
    The RoadActive Suspension Custom Leaf Spring Enhancement Kit part # RAS34FR for a 2017 Toyota Tundra has a pre-load after installation so it would be considered sprung mass. It essentially becomes part of the leaf spring. They however will not increase payload. In regards to braking, the affects would be marginal but the pre-load will place more weight towards the front axle where the majority of the braking force will be.
    view full answer...
  • Recommended RAS Suspension Enhancement For 2010 Toyota Tundra 5.7L 2WD Towing 8000lb Travel Trailer
    For your 2010 Toyota Tundra 2WD with a Snug Top Camper Shel towing a 34' Travel Trailer with 800lbs tongue weight and 8000lb trailer weight using a weight distribution hitch I recommend the RoadActive Suspension Heavy Duty # RAS34FR with a 3000lb load capacity. This kit can be adjusted in two ways depending on the exact stiffness and load support you want, but in your case I would go ahead and use the lower setting which is the thinner spacer. The reason I recommend going with the Heavy...
    view full answer...
  • Can RAS34FR RoadActive Suspension System Be Used Along With Weight Distribution
    The US- made # RAS34FR RoadActive Suspension kit is a fit for your 2006 Toyota Tundra and would be an excellent addition to augment your rear suspension and to improve your ride quality whether the truck is loaded or unloaded, towing or not. The system will work along with your Equal-i-zer weight distribution system to level out your ride height between the front and rear axles and will also help prevent axle wrap and wheel hop. You'll want to be sure to repeat the set-up procedure for...
    view full answer...
  • Looking For Replacement T-Brackets For An Aluminum Ladder Rack On A Trailer
    From looking at your picture, the Replacement T Bracket for Rack'em Fitz-All Enclosed Trailer Ladder Rack # RA34FR may work for you, but I couldn't tell for sure. With that being said, I created a diagram with all the measurements that should help. Please note that I am no artist and the diagram isn't pretty. However, the measurements are accurate. I did forget to include that the overall height of the part is 12". With the way the bracket is sitting in your picture, I think the inner...
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  • Rear Suspension Enhancement Recommendation for 2021 Toyota Tundra Hauling a Toy Hauler
    For your 2021 Toyota Tundra I definitely recommend the RoadActive Suspension kit, # RAS34FR. Especially since you already have a WDS in play with your set-up. This provides great support in preventing sag and it improves handling and ride quality when either towing or not as the RAS adjusts to your load to level your ride. This attaches to your vehicle's factory leaf springs but converts them into a mechanically active suspension system reducing dangerous sway and body roll while cornering...
    view full answer...
  • Best Rear Suspension Enhancement for 2021 Toyota Tundra
    For your 2021 Toyota Tundra the best rear suspension enhancement is the RoadActive Suspension kit part # RAS34FR as it is very easy to install, provides adjustable support, does a great job eliminating sag, improves handling and stability, and unlike other options it improves ride quality when loaded and unloaded so it is the best all around solution.
    view full answer...
  • What is the Difference Between RoadActive Suspension Enhancement RAS54FR and RAS34FR?
    The RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS34FR is a fit for the 2000-2021 Toyota Tundra. While the RoadActive # RAS54FR is for certain 1990-2022 Chevrolet/GMC 1500 series trucks. Each kit is specific for the leaf springs length on the truck they are designed to fit. Both of these kits are heavy duty with a 3,000lb rated capacity. You will need to select the correct kit for your vehicle.
    view full answer...
  • Higher or Lower Capacity RoadActive Suspension Kit for 2005 Toyota Tundra
    I always recommend the higher rated RoadActive Suspension kits like the part # RAS34FR that fits your 2005 Toyota Tundra. This gives you additional capacity if needed over the lighter duty model but also can be adjusted lower if ever needed as well.
    view full answer...
  • 2021 Tundra TRD Pro Spring Enhancement Kit For Increased Stability and Reducing Squat
    If you're already using a weight distribution system and are still experiencing squatting then you may want to check to ensure you have the proper weight distribution system for your trailer. I recommend going back and making sure the system has been set up properly. You should also check your trailers fully loaded and ready to tow tongue weight, which should include the weight of anything in the truck bed behind its rear axle. You'll want to check that this weight isn't more than the tongue...
    view full answer...
  • Suspension Enhancement Recommendation for 2018 Toyota Tundra that Improves Ride Quality
    Timbren's actually have the reputation as providing the harshest ride quality of all of the suspension enhancement kits so that would not be my first choice. Instead I would recommend the RoadActive Suspension kit part # RAS34FR which will give you additional support, is adjustable, and also actually improves the ride quality and stability unlike other options that will make it harsher.
    view full answer...
  • Heavy Duty RoadActive Suspension That Fits 2017 Toyota Tundra 4x4
    Happy to help, and I was able to confirm with the manufacturer the correct Heavy Duty RoadActive Suspension kit that is a fit for your 2017 Toyota Tundra 4WD, which is the following part: - RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty # RAS34FR The RAS is a really good choice for suspension enhancement for your Tundra, as it will keep your truck level, help with any body roll you might experience, while also giving your truck better traction and handling when...
    view full answer...
  • Best Suspension Enhancement for 2016 Toyota Tundra Towing Trailer with Bounce
    To prevent the bouncing you are experiencing and give you the best support and ride quality you'd want the RoadActive Suspension kit part # RAS34FR. Unlike other similar options this would give you the best overall ride quality while giving you the support you need to prevent the bouncing.
    view full answer...
  • Suspension Enhancement Recommendation for 2008 Toyota Tundra with Gooseneck Hitch
    For your 2008 Toyota Tundra the suspension enhancement I would recommend the highest is the RoadActive Suspension kit part # RAS34FR as it gives you adjustable support like you are wanting but it also gives you a better ride quality and handling unlike the other options so it's the best overall solution.
    view full answer...
  • Are Adjustments Required For The RoadActive Suspension?
    You will want to verify that you still have the correct amount of spring tension on the RoadActive Suspension # RAS34FR on your 2012 Toyota Tundra SR5. I recommend keeping the gauges, 1mm and 2mm in your Tundra at all times. Before you load your Tundra or connect to your trailer you will want to ensure that the spring tension is properly set to prevent damage to the RAS and keep your Tundra as level as possible. Keeping your Tundra level will ensure that you maintain even braking and do...
    view full answer...
  • Best Suspension Enhancement For 2021 Toyota Tundra For Ride Quality When Towing
    The best thing you can add to your 2021 Toyota Tundra to improve the stability and ride quality of your truck when you are towing is an active suspension kit, and the correct one is going to depend on the amount of squat you have and/or the tongue weight you have: - Less Than 2 Inches of Squat and/or Less Than 600 lbs of Tongue Weight: RoadActive Suspension Custom Leaf Spring Enhancement Kit # RAS4611TD - More Than 2 Inches of Squat and/or More Than 600 lbs of Tongue Weight: RoadActive...
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
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