1. Vehicle Suspension
  2. RAS
  3. Leaf Springs
  4. Rear Axle Suspension Enhancement
  5. Standard Duty
Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit

Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit

Item # RAS4611TD
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Our Price: $469.00
Vehicle Suspension

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RAS Rear Axle Suspension Enhancement - RAS4611TD
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2,000-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. Lowest Prices for the best vehicle suspension from RAS. Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit part number RAS4611TD can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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RAS Vehicle Suspension - RAS4611TD

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

2,000-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:

  • 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 braking 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 and eye bracket
    • Fully assembled kit and hardware are included
  • Maintenance-free - adjustments and monitoring aren't needed once installed
  • Made in the USA


Specs:

  • Weight capacity: 2,000 lbs
    • Roadmaster Active Suspension will not increase your vehicle's weight-carrying capacity
  • 2-Year warranty
  • 30-Day money-back guarantee


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



This Product Fits The Following Vehicles





Customer Reviews

Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit - RAS4611TD

Average Customer Rating:  4.7 out of 5 stars   (127 Customer Reviews)

2,000-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.

- RAS4611TD
by:
2018 Toyota Tundra

Very easy to install and make a big difference towing a trailer! 717907



- RAS4611TD
by:
2013 Toyota Tundra

I really like the suspension add on. It keeps my truck level when towing our 9000 lb camper bumper pull. I get great stability on the road and it helps with handling the tongue weight on my 2013 Toyota Tundra 1/2 ton. It doesn't change the stiffen the suspension of my truck until I add weight. So, you don't notice it with normal driving. Installation went smoothly. The components were high quality and heavy duty. I recommend it. 577747



- RAS4611TD
by:
2015 Toyota Tundra

Mounted on 2015 Tundra ,pull heavy car trailer and toy box these work great and are adjustable. Unlike airbags they won't leak and much easier install. They helped level truck when I'm loaded and resolved some front braking issues with the sensors on these new vehicled. 319138



- RAS4611TD
by:

We added these to my 2017 Tundra which we use to pull a gooseneck horse trailer. We camp on USFS lands and roads can be bumpy, rutted, etc. this stiffens up the suspension and we’ve never had any issues with bottoming out. 873196



- RAS4611TD
by:
Toyota Tundra

When I began the installation I set up the Tundra on my slopping driveway with chocks and attempted to jack it up with my small floor jack. Once I saw that I had to remove the spring eye plate I decided it was not very safe. I ended up going to my son-in-laws where he had a floor lift. After lifting the truck it was a very easy installation. I did watch U-tube about 6 or 8 times to make sure of the adjustments and as I said it went very well. Here are a couple of photos. 824255



- RAS4611TD
by:

So easy to purchase w - Jessica/ Parts came across US just in time. 2nd X buying these, so will see HOW they fit in a couple of weeks. THX & God bless..PRAYING for safety of all concerned with virus. 763917



- RAS3611-B
by:

Review from a similar RAS in Vehicle Suspension


product came very fast! all was packaged extremely well and no damage to any of the items I ordered. I have not installed them yet but I am excited to get them on and hopefully see that they take that little extra sag out of my truck while pulling my travel trailer! watched many video's on the installation process and seems to be very simple and straight forward... thanks etrailer 307783



- RAS3611-Y
by:

Review from a similar RAS in Vehicle Suspension


I did a lot of research to determine if I should use airbags or the RAS. For my application the RAS was the better choice. No matter who I asked, no one had a negative comment about this product (RAS). I tow a Jayco Travel Trailer (TT - 9000lbs) and while I have towed boats for years I was new to the type of tongue and hauling weight that the TT exerts on my vehicle. Installation was a breeze. I spent more time preparing my tools and finding my 22mm wrench than I did installing the RAS. There are many Youtube videos on how to install the RAS and I do recommend you watch them. My ride (F150 Echoboost) was smoother while pulling the trailer; however, I didn't feel any change to my daily driving (positive or negative). If you're using a WDH, I recommend these over the airbags. The airbags can be counter intuitive since the WDH should fix most of the weight distribution and level. The RAS works well with all WDH's and once installed you don't have to make any changes to it, unlike the airbags. Get the RAS - you'll be happy you did. 399233



- RAS3611
by:

Review from a similar RAS in Vehicle Suspension


Repeat customer. Just installed my second set of Roadmaster Active Suspension springs. Have not towed with them yet; however the ride on my 2014 F150 6.5' bed pickup is noticably smoother. I expect the result when I do tow my travel trailer to be the same as with my previous truck - night and day difference (no more "white knuckle towing)! 319927



- RAS3611-B
by:

Review from a similar RAS in Vehicle Suspension


2018 F150 4x4 owners pay attention to this review. I received the order today and unfortunately it was the wrong kit for my vehicle. Even though etrailer confirmed that a RAS3611-B is correct for my truck, it is actually for a F150 4x2. I contacted etrailer and costumer service rep was great and verified that initially the same part number came up for my vehicle, causing the confusion. My mistake, etrailer mistake. The correct kit for a 2018 Ford F150 4x4 is RAS3611-Y. etrailer is splitting the cost of return shipping and my correct kit has been ordered. etrailer has great costumer service. 567680



- RAS3611-Y
by:

Review from a similar RAS in Vehicle Suspension


I have a 2016 F-150 4x4 with a 2 inch leveling kit and 305 tires. I am towing a 26RR Grey Wolf camper. I beleave it is 4992 lbs dry wait and 7775 lbs loaded. It is meant to be pulled with 1/2 ton trucks. Want to give all specs to be fair to the product. The product was easy to install. I adjusted spring to the black disk. When I hooked up the camper I notice my truck definitely squated less. The towing ride was less bumpy. That is it. It definitely did not improve fuel mileage. I am still at 8.5 miles to the gallon. That is on flat ground, I live in Florida. Still could not go over 65mph without camper feeling loose on the road. 3 stars for now until I tow other trailers. It was an improvement but not as much as I was expecting. Still going to go truck shopping for a bigger truck to solve my towing needs. Side note: truck looks great and rides way better without a trailer in tow. 2/22 inf 744719


Comments
The Roadmaster Active Suspension is designed to improve your trucks stability, handling, and control by keeping the truck level even when youre towing. When you say that your camper feels loose on the road, it sounds like your trailer starts to sway at speeds above 65 mph. The best solution for keeping your trailer tracking straight while rolling down the road is to use a weight distribution system with sway control. A weight distribution system will not necessarily improve your fuel mileage, but it will improve your experience towing your 30ft trailer. I have linked a help article on Weight Distribution systems for more information.
-- Victoria B - 01/27/2020

64875

- RAS3611-Y
by:

Review from a similar RAS in Vehicle Suspension


I own a 2017 F150 and placed the RAS3611-y kit last year. So far the ride improvement and the handling when pulling my equipment trailer with 7000# load is great. Air load adjusters would have been a mistake. Thanks George J. for a great product. No need for load levelers with this kit. 675401



- RAS3611-Y
by:

Review from a similar RAS in Vehicle Suspension


Worked as described and made a big improvement towing our travel trailer. 526259



- RAS3611-Y
by:

Review from a similar RAS in Vehicle Suspension


Thanks I put the springs on today’s. I have one question, I adjusted them to the 20% / one millimeter. Can they be adjusted to the 40% with truck sitting on ground if my trailer still has the bounce in it when hooked, or will I need to lift it off ground to readjust if needed. 590227


Comments
According to the manufacturer, when the suspension system is adjusted, the vehicle must be raised with the axle hanging free. This releases most of the spring tension.
-- Mike L - 12/12/2018

46660

- RAS3611-B
by:

Review from a similar RAS in Vehicle Suspension


After going back and forth with your install techs before purchasing they said what product to buy. I order it and doesn't fit my truck due to flipped rear axle I gave them pics so product was returned 411832


Comments
Hello David, I am sorry this product did not fit your truck. I spoke with our Roadmaster Techs and they told me this kit is not a fit for your truck since your truck suspension is not factory spec. This kit is only confirmed to fit the fit-guided vehicles with factory suspensions.
-- Sarah H - 08/02/2017

26776

- RAS4611
by:

Review from a similar RAS in Vehicle Suspension


Haven't towed or hauled anything heavy with it yet. Unloaded it does help with body roll in turns. The ride is slightly improved as the truck doesn't bounce as much. 519027



- RAS3611-B
by:

Review from a similar RAS in Vehicle Suspension


After debating whether to go with these or airbags for a year I’m very happy with my decision to purchase these for my 2015 F150. Installation was simple, the difference in ride and towing is great, and there’s no maintenance. With 1,000lbs of trailer tongue weight and improved stability, I’m a happy camper! 583586



- RAS3611-Y
by:

Review from a similar RAS in Vehicle Suspension


I've only done a couple quick test drives with the product after installation. However so far am i initial impression is very positive. 450228



- RAS3611-Y
by:

Review from a similar RAS in Vehicle Suspension


Just like your advertising said they were very easy to install. My ride has not been affected it still is a great ride for a truck. After the installation the rear end of my truck was 2” higher which will help when I hook up my camper, instead of sagging now my truck is level they are a great product . Thank you 540473



- RAS4611
by:

Review from a similar RAS in Vehicle Suspension


I bought this based on I think the same product I bought several years ago for a 1997 Dodge Ram 1500. At that time, I bought a kit for for a Ram 2500 and was very impressed. I put a truck camper on the Dodge and I don’t think it settled an inch and when I drove it I hardly knew the camper was back there at all. No sway and no handling problems at all. This time I bought the kit for a Nissan Titan, pulling a 25’ travel trailer (about 7000#). The truck rear still settles and is not in a level attitude in transit without the weight distribution hitch. The suspension kit makes it better but not as much as I expected. 565780


Comments
Working just fine.
Jim - 10/02/2019

62634

- RAS4514-SAT
by:

Review from a similar RAS in Vehicle Suspension


Prompt shipping, good price, happy. The Roadmaster was easy to install and works as advertised. Truck used to squat under weight. Now even with the riding mower in the back, I cant even tell its there. No squat and good handling. Unloaded there is no effect on ride. Cranked to max, raised the rear about an inch. Like them. 364203



- RAS3611-B
by:

Review from a similar RAS in Vehicle Suspension


I installed the product easily within less than an hour. On the test drive after, my truck rode smoother and more precise than prior to the install. I gained about 1-2 inches in lift on the back end, but have not towed with the setup yet. I would recommend this product. Very satisfied so far. 617063



- RAS3611-Y
by:

Review from a similar RAS in Vehicle Suspension


I have had this product a couple of months now with two trips pulling my travel trailer. It has helped in leveling out the truck/trailer so that less pressure is applied to the weight distribution system. Product is easy to install, I didn’t even need to take the tires off. It also is easy to adjust to fit different hitch weight. It did make my truck ride a little ruff but not to a point that is uncomfortable. I chose this product over air type products as I didn’t want to have to mess with it. I would recommend this product. 593932



- RAS3614-T
by:

Review from a similar RAS in Vehicle Suspension


I have Nissan 2500 van that I have converted for traveling. Its gross weight is 9000 lbs, and with all that is in it everyday it weighs around 7000 lbs. It has enough weight it sags. I occasionally pull a trailer, which makes the sag even worse. I install the RAS, and it added about 1 1/2 inches to the truck height. I haven't pulled with it yet, but around town it rides great. Maybe, a very slight stiffening of the suspension, but nothing like what Timbren does to a truck. These things were terrible to install. The instructions said there wasn't much clearance on this vehicle, so take apart the unit and put the spring hooks on before lifting the vehicle. I thought I was going to have to unbolt the springs. Using a jack in the right place allowed me to finally getting them into place. It did require much frustration, and some choice language before I finally got them installed. I'm still looking forward to towing with them to see if the sag problem is fixed. I do recommend these. Again on a Nissan van they are a b*tch to install. 650068



- RAS3611-Y
by:

Review from a similar RAS in Vehicle Suspension


Delivery was on time and the product was good and ready to go! Jacked up the truck put it on stands and 1hr 30mins later I was driving off for a test run. Works just like it says it would. No body roll, takes off so much smoother, and I did about 40 over those big rolling neighborhood speed bumps and it was super smooth. Before RAS it would have a real bouncy feel over the speed bump now it attack the bump if you know what I mean. I tow a 25' trailer so I can't wait to see how much bounce is taken out when I'm driving over the dippy roads through the mountain pass here in WA. Thanks E-trailer! 313970


Comments
My initial review was was 5 star rating and after one year of use it still remains a 5 ??. I have a chance now to tow my 25’ travel trailer for a season and works great. It helps with proposing and reduced the little sag when I have her loaded up for a long trip. Highly recommend RAS with a WDH combination for smooth comfortable towing experience.
Doug D - 11/05/2017

30566
29
165
Show More Reviews

Ask the Experts about this RAS Vehicle Suspension

  • Which Roadmaster Active Suspension Kit Fits 2014 Toyota Tundra
    Roadmaster Active Suspension does offer a kit that fits your 2014 Toyota Tundra with the part # RAS4611TD but the part number you mentioned does not fit your truck.
    view full answer...
  • Best Suspension Enhancement for 2019 Toyota Tundra
    Easily the best way to improve the suspension on your 2019 Toyota Tundra is with the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit # RAS4611TD because it is an active system which works to continually reinforce your original leaf spring suspension, and like you wanted, it requires zero maintenance whatsoever. The force normally put on your Tundra's current leaf springs - either when carrying cargo or when making a tight turn - gets transferred to the RAS Enhancement...
    view full answer...
  • RAS4611TD or RAS4611 For 2002 Toyota Tundra
    For a 2002 Toyota Tundra the correct Roadmaster Active Suspension kit is the part # RAS4611 as the # RAS4611TD is for newer Tundras that were made in 2007 and after. I verified this with RAS too to make sure it was still correct.
    view full answer...
  • Recommended Suspension Enhancement to Reduce Axle Wrap when Towing with 2012 Toyota Tundra
    The only option to assist in your towing experience due to axle wrap or wheel hop is to add the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit # RAS4611TD. This system will attach to the leaf springs on your vehicle and stabilize the springs when under load. The RAS tension springs disengage when not under load so they will not change your unloaded ride. If you also have side to side sway, then I recommend the Roadmaster Rear Anti-Sway Bar for Trucks # RM-1189-102...
    view full answer...
  • Recommended Rear Suspension and Parts Needed for Truck Bed Camper on a 2008 Toyota Tundra 8ft Bed
    I can help you outfit your 2008 Toyota Tundra Limited for your camper. To help with the rear sag of the Tundra, I recommend the Roadmaster Active Suspension # RAS4611TD, because of its adjustability and low maintenance. This kit is compatible with 4 wheel and 2 wheel drive models. There are a couple components you will need for your truck camper to mount to your truck properly one of those components will be Frame Mounted Tie-Downs. The TorkLift Custom Frame-Mounted Camper Tie-Downs...
    view full answer...
  • Rear Suspension Enhancement Recommendation for 2007 Toyota Tundra
    If you still are experiencing sag with the weight distribution system that can mean a few things. Either the system is rated too low, the system isn't setup properly, or the vehicle is being overloaded. While we can help you pick out suspension enhancement I'd first verify those three things. You want to make sure the loaded tongue weight of your system falls right in the middle of the range of your setup. For suspension enhancement for your 2007 Toyota Tundra that will help the most...
    view full answer...
  • Recommended Roadmaster Active Suspension Kit For 2018 Toyota Tundra With Level Kit
    I do have an option for you but the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit part # RAS3611 is not a fit for the 2018 Toyota Tundra however the Roadmaster active suspension systems are compatible with a leveling kit. I recommend to use the Roadmaster Active Suspension Custom Leaf Spring Enhancement Kit part # RAS4611TD which is going to support the leaf springs to level out the ride. This system helps to extend the life of your suspension on the truck especially...
    view full answer...
  • Best Way to Control Sway for 2010 Toyota Tundra That Has Anti-Sway Hitch
    Ok, so there's a couple of things you'll want to do first, and that's just make sure you check your tongue weight. You'll want to be somewhere between 10% and 15% to ensure your trailer is loaded properly and the weight is distributed evenly. Additionally, a trailer that is 10,000 lbs is very close to the upper capacity of your 2010 Toyota Tundra 4WD, and that truck towing a long 34 foot trailer with that much weight is going to cause some sway, even with a weight distribution system. While...
    view full answer...
  • Suspension Enhancement Recommendation for a 2008 Toyota Tundra with Gooseneck Hitch
    I do have a solution for you to add some suspension enhancement to your 2008 Toyota Tundra but unfortunately there are no air bag kits that will fit with the Curt Double Lock Underbed Gooseneck Hitch # C60751 or any other gooseneck/5th wheel hitch on the 6-1/2' bed of your pickup. There are 2 different suspension enhancements that you can utilize and since they are both excellent products it all depends on if you are okay with drilling or not. The TorkLift StableLoad Rear Suspension...
    view full answer...
  • What is Best Way to Reduce Sag When Towing with 2015 Toyota Tundra
    I understand what you mean by wanting to go above and beyond with your towing setup so that it's as safe as possible but also you don't want to ruin the ride quality of your wife's Tundra so I have what I feel is your best solution. So instead of suspension enhancement your best solution is actually a weight distribution system. A WD system reduces sag like suspension enhancement but since it does so by moving some of the tongue weight of the trailer to the front axle of the tow vehicle...
    view full answer...
  • Air Ride Suspension System for 2011 Toyota Tundra with a 6 inch Lift
    As long as you don't have a 5th wheel or gooseneck hitch installed, then we have a Firestone Ride-Rite kit that will work for you. I recommend installing the Ride-Rite Kit, # F2445, because you can use the Ride-Rite Lift Spacers for a 6 inch Lift, # F2375. These two parts will accommodate the 6 inch lift on your truck. The Ride-Ride kit will not fit if you have a 5th wheel hitch or gooseneck hitch installed in the bed. I'm not sure what type of lift you have, but if your truck is still...
    view full answer...

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Info for this part was:

Expert Research:
Jameson C
Installed by:
Randy B
Edited by:
Daron K
Written by:
Jessie B
Updated by:
Matthew E

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