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  1. Vehicle Suspension
  2. RAS
  3. Leaf Springs and Helper Springs
  4. Towing/Load Leveling
  5. Rear Axle Suspension Enhancement
  6. Standard Duty
THIS ITEM IS NOT A FIT FOR
2006 Nissan Frontier
etrailer Installation
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RAS

RoadActive Suspension Custom Leaf Spring Enhancement Kit

Part Number: RAS4612-DV
In Stock
$539.00
Vehicle Suspension
Not Confirmed to Fit

2006 Nissan Frontier

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etrailer Installation
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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. Great Prices for the best vehicle suspension from RAS. RoadActive Suspension Custom Leaf Spring Enhancement Kit part number RAS4612-DV can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (544)
  • Q & A (0)
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RAS Vehicle Suspension - RAS4612-DV

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • 2,000-lb Load Support: Levels your ride and keeps steering and braking stable when towing or hauling.
  • Instant Load Response: Springs automatically stiffen under weight to stop sag before it starts.
  • More Stability in Turns: Reduces sway and body roll for safer cornering and highway control.
  • Stops Axle Wrap and Wheel Hop: Keeps tires planted to improve traction and prevent bottoming out.
  • Zero Maintenance Required: Fully assembled bolt-on kit needs no air checks or adjustments after install.
Made in USA

Features to know about

Stay Level and Confident Under Load: 2,000-lb Rear Suspension Support

When hauling heavy gear or towing, rear-end sag can throw off your handling and braking. The RoadActive Suspension Custom Leaf Spring Enhancement Kit turns your factory leaf springs into a mechanically active system with up to 2,000 lbs of load support. The variable-rated coil tension springs automatically adjust to the extra weight, keeping your ride level and stable whether you’re towing a camper or hauling tools. With the back end sitting right where it should, steering feels consistent and braking stays predictable.

Illustration showing how RoadActive Suspension keeps a vehicle level when loaded, preventing rear sag and improving traction and braking control.

Drive Smoother and Safer: Active Control Against Sway and Roll

Heavy loads can make your rig sway through turns or lean on curves. This system strengthens your leaf springs to reduce body roll and sway before they even start. The tension springs react instantly to shifting weight, keeping the rear planted when cornering, swerving, or battling crosswinds. You’ll notice steadier tracking on the highway and more control through uneven roads without adding stiffness when unloaded.

Eliminate Axle Wrap and Wheel Hop: More Traction and Less Wear

When weight pushes down hard on the rear axle, leaf springs can twist and let the tires hop under acceleration. The RAS kit stops that motion by absorbing the load force energy before it reaches the axle. That keeps traction consistent, even when braking or climbing steep grades, while also cutting wear on shocks, shackles, and tires. It’s a simple way to smooth out power delivery and extend the life of key suspension parts.

Photo showing RoadActive Suspension stabilizing rear axle to eliminate axle wrap and wheel hop for smoother performance under heavy loads.

Easy Bolt-On Installation: Fully Assembled and Maintenance-Free

Installation is straightforward—no drilling, cutting, or welding required. Each unit bolts under the leaf spring and around the factory U-bolts using the included hardware. Once installed, it’s maintenance-free with no adjustments or monitoring needed. The high-grade alloy steel construction and epoxy e-coated finish provide corrosion resistance with bracket coatings tested to more than 800 hours of salt spray exposure. This system is built for long-term strength you can set up once and trust for years of hauling and towing.

Photo showing RoadActive Suspension kit fully installed on a vehicle’s rear leaf springs using factory U-bolts for easy bolt-on installation.

Specs

Weight and Capacity

  • Weight capacity: 2,000 lbs
  • RoadActive Suspension will not increase your vehicle's weight-carrying capacity

Diagram of RoadActive Suspension system installed on a vehicle’s rear leaf springs showing how the RAS unit attaches to enhance stability and load support.

Warranty

  • 5-Year warranty
  • 30-Day money-back guarantee

4612-DV RAS Custom Active Suspension System for OEM Leaf Springs - Rear Axle



This Product Fits The Following Vehicles




Ratings & Reviews

4.7

544 reviews
Review sort icon
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.

by:

I installed the Road Active suspension standard duty kit on my 2017 Tundra. I was hoping for a smoother ride with and without a load and I was not disappointed. I don’t do heavy hauling, just a center console boat that weighs about 3000 pounds with trailer. My truck definitely has a smoother ride. It is especially noticeable on rough spots like bridge crossings, etc. I set the springs somewhere in between the light and heavy settings. I used a quarter as a spacer. It raised the rear of my truck one inch. I definitely recommend the Road Active suspension and etrailer is the best place to buy it.



by:

Helps immensely, 12x6 inclosed trailer from NY to Florida and back up to NJ no problems



by:

Made all the difference in the world! Also, easy to install. Yes, the ride is stiffer, but when I'm dragging the 10K of weight in the trailer, it's worth it.



by:

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:

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.



by:

I Have had this suspension on multiple trucks and i love it . It takes the sway out of the truck when entering a exit ramp and taking sharp turns with a trailer or without, also reduces wheel hop and increases payload in the bed of the truck.I would recommend for all trucks pulling trailers.



by:

Hands down the engineering behind the product was well executed and would recommend it to anyone who's travels involve pulling any type of trailer. You will feel a much smoother ride even when not pulling a trailer at all.



by:

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.



by:

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.



by:

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



by:

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:

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



by:

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.



by:

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.



by:

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:

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:

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:

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:

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:

These made such a difference in the ride of my pick up while pulling my enclosed trailer. Let’s squat more stability.



by:

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:

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:

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.



by:

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!



by:

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


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See what our Experts say about this RAS Vehicle Suspension

  • Recommended Suspension Enhancement For 1996 Roadtrek Class B Motorhome
    We have a system that will work great on your 1996 Roadtrek. I recommend the RoadActive Suspension Kit, part # RAS4612-DV. This system not only adds strength to the leaf springs but it also helps reduce sway and body roll. I called my contact at RoadActive and they said you will want to make sure you have at least 4-inches clearance above the leaf springs from the center of the axle back to the rear eye on the leaf spring to get this to work.
    view full answer...
  • Recommended Suspension Enhancement For Roadtrek RV on 1996 Ram 350 Chassis
    The RoadActive Suspension Kit, # RAS4612-DV will give you and adjustable system with a 2,000 lb capacity. It will give you support and help reduce sag. If you are looking for a stronger capacity, I recommend the Timbren Rear Suspension Enhancement System, # TDR3500. This system will give you a 6,000 lb capacity. These spring function as a stabilizer and help level your vehice. They become more rigid as more weight is added to support the load. This will help with stability and compensate...
    view full answer...
  • Rear Anti-Sway Bar for a 1996 Dodge Roadtrek
    The Roadmaster Rear Anti-Sway Bar part # RM-1129-111 is a fit for a 1996 Dodge Roadtrek with or without water tanks to the best of my knowledge. That said, these water tanks may have to be removed for installation but only temporarily to get the anti-sway bar in place so this is still an option for you. If you want to go with the RoadActive Suspension Custom Leaf Spring Enhancement Kit part # RAS4612-DV this would work as well but it will also stiffen the rear suspension as would any...
    view full answer...
  • Suspension Enhancement Recommendation for 1995 Dodge Van B3500 with Oversize Tires
    Running more than one suspension enhancement kit can sometimes "work" but the problem is you end up with such a harsh ride quality that it becomes unbearable. For that amount of support you are wanting from your 1995 Dodge Van B3500 the best option is going to be the RAS kit part # RAS4612-DV with a lot of support adjusted in. The RAS kits do the best job giving the support like you are wanting without killing the ride quality. To basically just prevent bottoming out the RAS kit would easily...
    view full answer...
  • Weight Capacity of RoadActive Suspension Kit for Dodge Van
    The 2,000 pound weight capacity listed for the RoadActive Suspension Kit # RAS4612-DV referenced in your question refers to any additional load carried on your 1996 Road Trek 190 and that is applied to the axles. The suspension kit capacity does not necessarily refer to the total weight of the motorhome, but to the added weight it is designed to stabilize. If your motorhome uses the 1996 Dodge Van, then this system is confirmed to fit and will upgrade the factory suspension for improved...
    view full answer...
  • Comparing Air Kit w Active Suspension Enhancement
    My understanding from your described situation, I recommend an air bag system for your 1997 Dodge 2500 Van. Both options will greatly improve your ride quality for the situation you described but the Air Lift LoadLifter 5000 Ultimate Air Helper Springs with Internal Jounce Bumpers, # AL88105, have the advantage of easier adjustability once installed. You will better be able to adjust increasing your payload from no bike to one bike to two. Adjustability of off-center load when hauling...
    view full answer...

Do you have a question about this Vehicle Suspension?


Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Mary K
Written by:
Mary K
Employee Wilson B
Updated by:
Wilson B
Employee Noah M
Updated by:
Noah M
Employee Michael B
Installed by:
Michael B

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