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RoadActive Suspension Custom Leaf Spring Enhancement Kit
(550 reviews)
Price: $539.00
In Stock
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RoadActive Suspension Custom Leaf Spring Enhancement Kit
Part Number: RAS4514
In Stock
$539.00
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- Reviews (550)
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RAS Vehicle Suspension - RAS4514
Highlights
- Custom Fit for Your Vehicle: Mounts to existing attachment points
- 2,000-lb Load Support: Keeps your truck level when towing or hauling heavy gear for safer control.
- Smoother, Safer Handling: Reduces sway, bounce, and body roll so your ride feels stable and predictable.
- Better Traction Under Load: Helps tires stay planted during braking and acceleration for added confidence.
- Zero Maintenance Required: Once installed, it needs no air adjustments or upkeep for dependable performance.
- Bolt-On DIY Install: Fully assembled kit mounts with basic tools—no drilling or welding needed.
Features to know about
Stay Level and Confident Under Load: 2,000-lb Rear Suspension Support
When you’re towing a trailer or hauling a heavy load, sag in the rear suspension can mess with handling and braking. This RoadActive Suspension kit adds up to 2,000 lbs of support by turning your factory leaf springs into a mechanically active system. The variable-rated coil tension springs automatically adjust to your load, keeping your ride level and steady while improving traction and control. No air lines or compressors needed—just solid, mechanical support you can count on.
Smooth Ride Whether Loaded or Empty: Automatically Adjusting Coil Springs
You don’t have to choose between a smooth daily ride and strong towing support. The RAS coil tension springs engage only when you add weight, then disengage when unloaded. That means the truck rides normally when empty, but firms up instantly when you’re carrying tools, campers, or a trailer. The system reacts immediately to the load, stopping sway and squat before they even start.
Eliminate Axle Wrap and Wheel Hop: Stronger Leaf Spring Control
Heavy loads can twist leaf springs and cause wheel hop that feels like the rear end is bouncing off the ground. RAS stabilizes your leaf springs so they stay in their proper bowed shape. This design eliminates axle wrap and wheel hop while reducing strain on your shocks, shackles, and tires. You get smoother takeoffs, better traction under braking, and less wear on suspension parts over time.
Reduce Sway and Body Roll: Safer Handling Through Turns
When you’re cornering with a heavy trailer or bed load, body roll can make the ride feel unstable. The RAS coil springs reinforce your factory leaf springs to keep things level side-to-side. By cutting down sway and roll, the system helps your truck stay planted through curves, gusty crosswinds, and uneven roads—making long drives safer and less tiring.
Bolt-On Strength That Lasts: Corrosion-Resistant Steel Construction
Built from high-grade alloy steel with an epoxy e-coat finish, this kit is designed for real work and weather. The brackets have a salt spray rating of more than 800 hours for long-term corrosion resistance. It comes fully assembled for easy bolt-on installation with no drilling, cutting, or welding required—and once installed, it’s completely maintenance-free.
Specs
Weight and Capacity
- Weight capacity: 2,000 lbs
- RoadActive Suspension will not increase your vehicle's weight-carrying capacity
Warranty
- 5-Year warranty
- 30-Day money-back guarantee
4514 RAS Custom Active Suspension System for OEM Leaf Springs - Rear Axle
This Product Fits The Following Vehicles
- 1992 - 2011 Dodge Dakota
- 2010 - 2011 Ram Dakota
- 2006 - 2009 Mitsubishi Raider
Ratings & Reviews
4.7
550 reviews
by:
Martin
11/30/2021
by:
SamW
06/21/2026
2026
GMC
Sierra 1500
Just perfect to level the rear of my GMC 1500 Denali with the 29' Airstream (900 lb tongue wt). Preload is set at 1mm. I tried 2mm and it was overkill for this application. I was pleased with how easy the install was. I had to use a two jack hack to get the rear tires off since my 19" lift floor jack didn't quite have enough reach. You lower the differential after the tires are off so the rear axle is hanging free for the install. See photos
by:
John
09/13/2025
2022
Toyota
Tacoma
The install takes about 30 minutes with a floor jack and jack stands. You do not need to remove the center tension bolt just lengthen it out. Lay the assemble over the spring and install one bolt on the ender side. Snug up the spring to desired % of tension and you are good. I did not remove the tires there is no need as you can get to everything. If you can not secure the frame in the upright position with stands I would remove the tires for safety.
The good is the brackets fit nice on the leaf springs and at 25% (the white washer) it lifted the truck 1.5 inches.
The bad is the enhancement bracket that passes by the leaf spring on the drivers side rubs against the brake line hard. I am pretty sure this is an issue with the Tacoma pickups if you look on line. Customer service at etrailer gave me the I don't know you need to contact the manufacturer. Own up and do not pass the buck is my response to that answer. My fix was to loosen the hold down bracket on the brake line under the leaf spring assembly and add 2 washers behind it to move it out away from the plate 1/8 inch. While doing this and before retightening this bracket bolt I also loosened the line bracket bolt fixed to the axle farther to the right and rotated it a little while bending the brake line ever so slightly to create a 1/4 gap between the break line and the enhancement kit bracket when it was tightened back on.
My two cents.
The good is the brackets fit nice on the leaf springs and at 25% (the white washer) it lifted the truck 1.5 inches.
The bad is the enhancement bracket that passes by the leaf spring on the drivers side rubs against the brake line hard. I am pretty sure this is an issue with the Tacoma pickups if you look on line. Customer service at etrailer gave me the I don't know you need to contact the manufacturer. Own up and do not pass the buck is my response to that answer. My fix was to loosen the hold down bracket on the brake line under the leaf spring assembly and add 2 washers behind it to move it out away from the plate 1/8 inch. While doing this and before retightening this bracket bolt I also loosened the line bracket bolt fixed to the axle farther to the right and rotated it a little while bending the brake line ever so slightly to create a 1/4 gap between the break line and the enhancement kit bracket when it was tightened back on.
My two cents.
John
9/14/2026
Well It has not failed me yet. Being basically a spring under load all the time I am assuming the spring will stretch some over time and I will have to adjust tension accordingly. The pickup sits nicely on the thinner washer setting so I am leaving it there and hopefully that will help the system last longer.
by:
Raymond
02/24/2026
I don’t think they are really made for the old PU. 1997 k1500 8 ft bed with a 750 lbs camper tong weight I think I had to put to much pressure on the Kurt stabilizer chains to get level. It looked like the newer truck reviews on YouTube were great thanks Dingler.
by:
Les
06/22/2025
I purchased the RAS system 6 months ago to help with rear end sag & control while towing our 22 ft 4200lb camping trailer. It improved sag & helped handling even when not towing! I don't get the bounce when driving on bumpy uneven roads the wheels stay planted on the road. I recently purchased a 8000lb camping trailer & my 24 1500 Silverado handles it very well, I will adjust the RAS to the next step up for the extra weight when time permits.
The install took just over an hour with help from a friend & a car lift which is good since I'm 70 years old.
Great product!
The install took just over an hour with help from a friend & a car lift which is good since I'm 70 years old.
Great product!
Brooke M.
6/25/2025
Looks great, Les :) I hear lots of good this about this option for suspension enhancement and how you said, even without towing it can improve the ride quality. Glad to know that you are happy with them, too! do you have any upcoming camping trips planned?
by:
Vince
07/29/2025
I’ve bought a lot of products from etrailer and as always everyone I dealt with is professional and knowledgeable of the numerous products they sale. I used every resource they offer to help me decide what type of suspension upgrade I was going to use to improve the haul and tow ability of my 2017 diesel chevy Colorado 4x4 crew cab short bed. I chose the RAS system from Roadmaster. I also called them and ask some very detailed questions about using my OEM shackle instead of replacing with the plates in the kit and was told that was fine and that others had also. I got professional and knowledgeable info that helped make my decision. The product is exactly as promoted and every review out there on the internet about how good or unchanged the unloaded ride is after installing are true. My truck rides better now and it was already quieter and almost as smooth as my wife’s Cadillac. If your looking to improve the drive, tow and haul ability of your leaf spring vehicle, and I say vehicle instead of truck because I don’t know if they have them for other leaf spring vehicles, you are not going to find a better easier to install product that does that for your loaded or unloaded vehicle, IMHO. I will update in a year after next spring mulch haul. I don’t expect zero squat but hope to reduce and improve loaded steering performance. Took longer to jack up truck and remove tires than install kit.
by:
Scott
09/17/2026
Ford
F-150
Installation was very simple. Watched many installation videos and had no issues with installation. Wanted to gain an extra 1 inch in height in the rear on my F-150 while towing my travel trailer and actually gained 1.5 inches in the rear and only lowered the front by 1/4 inch. very satisfied with it so far.
by:
Stephen
07/17/2026
Ford
F-150
2023 F150. Install was fairly easy. Set at 25%. Ride unloaded a bit stiffer, but handling much better. Lifted rear of truck about an inch. Towing 7500 lb camper down NYS thruway which is crowded with much unforgiving bumps and pot holes the ride was more manageable. The 25+ mph cross winds did make for quite a bit of sway still, not as bad as before adding the RAS. Still felt passing trucks trying to suck me in, not as bad as before.
I plan on cranking the RAS to 40% on next camping trip and hopefully give the RAS 5 stars.
I plan on cranking the RAS to 40% on next camping trip and hopefully give the RAS 5 stars.
by:
Paul
08/18/2025
2022
Toyota
Tacoma
Easy install when I rotated tires. Forgot to measure height difference, but it did raise a bit. I like the adjustability and not having to remove springs and shackles to add a leaf. Will be towing the camper with improved support.
by:
Elden R
07/08/2025
Helps immensely, 12x6 inclosed trailer from NY to Florida and back up to NJ no problems
Gwendolyn Y.
7/23/2025
That's a long trek, so I'm glad these helped you along the way! Do you take that trip often, Elden?
by:
Jeff
06/08/2026
Nissan
Leaf
Great product, helps with sway and when the truck has additional weight it progressively compensates. I would add this to any vehicle with leaf springs.
by:
Sergio
08/12/2020
2011
Nissan
Titan
The bed of the truck measured 37.5" with a tool box weighing 200 lbs. The truck felt weighed down with passengers weighing 600lbs. Total weight 800lbs with a tank full of gas. After the install the truck rides smoother and certainly " like new". The stopping distance and acceleration distance have shortened drastically. I'm planning on loading up the bed and the Roadmaster Active Suspension RAS4611. My wife even drive it and she could feel the difference. "It drives like a muscle car." Buy it. Install time at a reputable mechanic shop was a 30 min. Install. I received them today at 1 pm and got it installed at 3:00 pm and finished the install at 3:30pm. It's an investment worth the price over traditional air bag system. Mechanic installed this on 2011 Nissan Titan SV.
Sergio J.
8/13/2021
What can I say. After a year of constantly driving through Texas roads and highways. I have moved twice and loaded the bed of my truck plus U-Haul 6x12 trailer and thy truck has not felt the load of it. The Active Road Suspension Leaf Spring is constantly sort of speak sensing if theres load so it can actively push it upwards. I have even driven up to the crazy roads of Pennsylvania and my pick drives smoother than when I got it from the dealer. Im telling you these things work. As any cautious driver upkeeping his own vehicle, I have periodically checked the bolts and location of the resistance in between the spring and it has not deflected or moved from its original installation. I believe every pick up must have these. It beats constantly putting air on the air bags especially in inclement weather like up here in Pennsylvania with the snow. I couldnt be more satisfied with this purchase. Thank you etrailer for offering this superb product.
Sergio J.
8/16/2021
Just like when I bought it.
by:
Miguel
07/09/2021
I love the product since i have a 2021 toyota tacoma crew cab long bed with a campertop a robber mat and a jack thats around 450 pounds that a have at all times my truck was sittind low a lilbit plus it was swagging on the road i have summo spring to help my suspention but it was not enoght so i did my research but this was my better option i just installed it yerterday july-8-2021 and went for a ride where i ussually drive everyday and WOW now my truck rides very smood plus it lift my tryck 1 inch on the back now my tryck seats level it took me about 2 hrs but i did right i just follow the intructions and done i love the product the only thing that im concern is that the left side underneat the springleaft there is a breik line that is too close to the roadmaster suspention i hope that with the time dont hit that line because if it does thats the line for the breiks and i will be in trouble replacing it other wise evreything works great i recomend it 100% thanks guys i will buy it again?????best $500 that i spend on my truck
Miguel
7/10/2022
Its been working very well i loaded a couple of times and its awesome
by:
Rick Maybury
03/26/2021
I have a 2020 Silverado 1500 6 cyl Duramax with the Diesel Off Road package (3.73 diff). Travel trailer loaded is probably about 6,000 lb. I took several measurements during and after the spring kit installation. All measurements increased about an inch including the stock suspension with trailer and equalizer bars and with the spring kit installed at 1 mm spacing. A one inch improvement overall. I took the truck on a short drive and didn't notice any difference in ride (wasn't stiffer) which is what I wanted. Good to know that I can adjust the springs to the 2 mm spacing if I want to increase the suspension assist. Going camping next week and looking forward to see how it improves handling and porpoising.
Rick M.
3/27/2022
After a year I am still pleased with this product. I had been adjusting the spring tension higher when towing and then back down after a trailering trip, but now just leave it adjusted to the trailer towing tension as the unloaded ride doesnt seem to suffer when the springs are tighter.
by:
Rich
03/05/2020
2011
Toyota
Tacoma
Easy install 2011 Tacoma crewcab long bed. Helped with sag when towing microlite travel trailer. Keeps the rear end raised in the rear a little when unloaded, but I like that look. Only complaint and its nothing big when truck is unhooked and empty when i get out I can hear alittle noise from RAS. Sort of like a bedspring coil. Night pic is with RAS installed daylight pic is with out installed
Rich
3/10/2021
Still working great. Towed a Flaggstaff microlite 23LB Travel trailer prob between 5 and 5500 LB’s to Niagra Falls with no problems, truck sat level with trailer and 2 adults,2kids. Getting ready to make a 2,000 mile round trip to disney in florida in a few weeks.
by:
Bruce
08/14/2026
These made such a difference in the ride of my pick up while pulling my enclosed trailer. Let’s squat more stability.
by:
Mark
03/27/2026
2017
chevrolet
Silverado
I haven't hooked up my camper yet but set the springs up with the white wafer and it raised my truck 1 1/2 inches which is the amount it dropped after I put on a fiberglass topper. The ride is just a bit stiffer but a lot less body roll I noticed. Not impressed with the 25 Silverado suspension compared to my previous 2017 truck. If the squat is still there after I hook up the camper, there is plenty of adjustment left.
by:
William
03/20/2020
2017
Ford
F-150
I found this items cheaper on another site but etrailer match and then beat the price.
Item installed super easy, more work jacking up the truck and taking the tires off. Can be installed with out removing tires just make it easier to get it in. The item did lift the back of my truck 1 inch. See Pics.
Item installed super easy, more work jacking up the truck and taking the tires off. Can be installed with out removing tires just make it easier to get it in. The item did lift the back of my truck 1 inch. See Pics.
William
3/30/2021
Makes the ride a little stiffer but its a truck. Great when pulling my 37 camper. Helps out a lot!!!!
by:
Brent k
04/09/2026
2001
Nissan
Leaf
i installed these on my 2001 ford f-250 4x4 and this is a huge upgrade whether your towing or empty.truck rides and handles better than it ever has. easy straight forward installation. you will need a t-55 for the front bolt and a 12mm ratchet wrench for the adjustable bolt that tightens the spring and a couple of 22mm and a 19mm wrench or crescent wrenches for the jam nuts. i took the weight off of the leaf springs for easy adjustment of the coil spring and used the thinner of the two disc that came with the kit and it raised the rear of the truck up exactly 1 inch empty without a trailer connected. if you use the thicker disc it will raise it more.
by:
Russell
09/01/2022
I received this kit in a very timely manner always do from etrailer have some issues with the instructions that come from roadmaster not a trailer the bump stop spacer didn’t say that you need to use the original bolt from the bump stop so it slowed me down greatly on the install however I took it out on a quick run without a load I do feel that this has made the unloaded ride smoother tomorrow I’ll be taking the trailer out for a bit and we’ll see how it works there and I’ll update this rating.
Russell
9/2/2023
OMG!! I have done extensive traveling with my trailer over the last year and the RAS system has made a huge difference in sway, road buffeting and squat. I can’t imagine not having this on any vehicle that tows!
by:
Alan
04/28/2026
Did not fit my 1995 F-150. ETrailer was very helpful in an effort to make any adjustments needed. We all decided that they were a "no go" for installation. Return was made easy. I have bought several other pieces of gear since. Thank Etrailer.
by:
ACE
07/11/2026
I have put these on every pickup that I have owned and not only does it assist with heavy loads, my tires have gone past 80,000 miles before needing replacement. All Chevy Duramax 2500's and 3500's!!
by:
Michael
06/21/2022
Overall, very happy with the product. GMC didn't have any way to improve the truck from squatting when I hooked up my trailer. This kit didn't stop the squatting but significantly reduced the bounce on bad dips in roads, bridge/road transitions and bad railroad crossings.
Michael
7/7/2023
Removed the Suspension Enhancement and installed Airlift. Cost more but rear-end isnt sagging 4.
by:
William
03/21/2026
ford
Ranger
Balances ability to tow my 1800 squaredrop Hiker camper with 350 tongue weight as well as roof top tent on Leer 180 camper topper. Better handles load and side to side tipping on '21 Ranger. Keeps sage to a minimum.
by:
Marvin C
11/04/2026
Ford
F-150
The Road Active Suspension kit improved the ride and handling of my F-150 when pulling my trailer. Unfortunately I was over the weight capacity for my truck and had to move up to a 3/4 ton truck to stay legal.
25
550
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Info for this part was:
Written by:
Mary K
Updated by:
Wilson B
Updated by:
Noah M
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Mike L.
6/23/2026
Nicely done, Sam! Thanks for the photos, we always appreciate those!