Save Up To 60% on HOT Independence Day Deals!
To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
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.
Features:
Specs:
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.
Roadmaster Active 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.
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.
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.
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.
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.
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.
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.
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.
Average Customer Rating: 4.8 out of 5 stars (31 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.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).
Tony - 04/20/2022
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.
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.
Dave - 02/10/2022Fairly easy installation. Some say the instructions are really good, but I benefited from watching videos prior to starting. It could be done with one person, but it would have been much more difficult with some of the tight spaces to hold and turn in. When the directions say that you might have to expand the kit for installation, they aren't kidding. This is much easier to do prior to connecting the hook end. One note, I set my tension to the higher setting, and measured a rise of 1.5 inches in the rear of my truck when unloaded. I did not feel a difference when just driving. I will get an opportunity to tow in the near future and will update my review.
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.
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.
I’ve heard etrailer is known for freaky fast delivery, the timeliness and value were even better than I anticipated!
Product showed up ahead of schedule and as advertised. Very easy to install and made a world of difference towing our 7k lb TT. Will NEVER haul without these again!
Once again etrailer delivers. My order was shipped the same day I placed the order. I watched a couple of [online] videos on installing the Roadmaster Active Suspension and they commented on how easy the installation is. That was my experience as well. I have a Toyota Tundra so there is an additional step, you have to remove the rear shackle bracket to install the eye bracket. I called Roadmaster's tech support with a couple of questions and their advice was invaluable. There is only so much information you can print in the installation instructions so talking to tech support is well worth the call. I just installed this so I have not towed my trailer yet. Driving without a load the ride is a little more firm and the cornering is more flat.
Install went smooth, hooked it up and it made a difference to my overland rig when fully geard up
The part is fantastic but etrailer sent me the wrong size. I had ordered the beefier one.
Jenny N - 06/24/2022 Jenny N - 06/24/2022Was 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.
Very fast shipping, easy to order. Will definitely use etrailer again
I did not want to write this till I had some road time, both regular and towing. Easy install. I found a great [online] video, specific to my Tundra, and that helped a lot. I took my time and it was still under 2 hours install. Road manners were generally unchanged afterwards except there is noticeably less body roll on turns and the rear hitch rides 1 inch higher than before installation. I set my gap to the white disc for my first tow. I pulled 5500#s and it had a pretty good ride. Braking was very stable. I was also using an E2 weight distribution and sway control hitch. I did notice a little up and down movement under acceleration, but it was better than I have ever experienced in the past. Really pleased that performance matched the hype.
Excellent. Great spring, installation was a breeze, preparation took most time. Installation was 20 minutes each. After truck loaded, front and rear heights are perfect
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 A - 12/07/2021It works good
We have a 2008 Toyota Tundra. This really helped a lot with stability and sway (don't have a sway bar). We have a Trailer with a 700 pound tongue weight, and this product combined with our WDH lelveled everything out. When unloaded it did raise the rear of the truck about 2 inches, I will be adding a leveling kit to the front end.
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.
It’s the second set I’ve owned with my first being on a Tacoma. Followed directions when installing and it went smoothly.
Awesome! Easy installation and works great. No more sag in the rear end.
Promised they would delivery by friday and I got it thursday instead. Was able to install before fridays trip. Works great, worth the cost in peace of mind alone, never mond safer.
Been in use for a year and still holding up.
I can't say enough good about this system. Super easy install. What a huge difference this makes. It's like I'm driving a whole new truck! Highly recommend.
Easy install quality parts. Fast delivery. Test drove nice can't wait to hook up to some weight.
Super fast shipping and excellent customer support. Would highly recommend doing buisness with etrailer.
Do you have a question about this Vehicle Suspension?
Info for this part was:
At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.