To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Add rear suspension support to your Ford F-250 for heavy towing and hauling. This RoadActive Suspension Mega-Duty system strengthens your factory leaf springs by up to 50% to help reduce squat, sway, bounce, and axle wrap.
When you hitch up a trailer or load the bed, the rear suspension can sag and throw off your handling. The RoadActive Suspension Custom Leaf Spring Enhancement Kit strengthens your factory leaf springs by up to 50% by turning your factory leaf springs into a mechanically active system. It automatically adjusts tension to the load, keeping your ride level whether youre towing, hauling gear, or carrying tools in back. You get steadier steering, better braking traction, and correct headlight aim no matter the weight behind you.

Heavy loads can make your truck lean or bounce through turns and cause wheel hop when accelerating. The variable-rated coil tension springs in this kit engage instantly to stabilize the leaf springs before problems start. They strengthen your suspension to cut down sway and body roll on corners while preventing axle wrap and bottoming out under weight. The result is a smoother, more controlled ride with improved traction during braking and acceleration.


Unlike systems that need constant pressure checks or air adjustments, this setup is ready to go after installation. Each unit bolts under the factory leaf spring and around the U-boltsno drilling, cutting, or welding required. Once tensioned during setup, the springs activate automatically when loaded and disengage when empty. Theres no need for regular monitoring or maintenance, just reliable performance every time you tow or haul.


Long days on the road mean exposure to rain, salt, and grit that can wear out lesser parts. Each RAS unit is made from high-grade alloy steel with an epoxy e-coat for corrosion resistance. The end brackets have a salt spray rating of more than 800 hours, giving them lasting protection against rust and harsh weather. You get a suspension upgrade that holds up to years of heavy use with confidence backed by a 5-year warranty and 30-day money-back guarantee.


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi everybody, Andy here with etrailer. Let's take a quick look together at this RoadActive Suspension Mega-Duty Custom Leaf Spring Enhancement Kit. Now, this has been designed to fit your 2011 to current Ford F-250s. And on custom fit parts, such as this suspension enhancement kit, I do recommend going through our Vehicle Fit Guide here at etrailer. Just pop in the year, make and model of your vehicle, and our Fit Guide will confirm if this will work for you or if we have something comparable that will work for you. Now, this custom leaf spring enhancement kit is going to be an upgrade for the rear leaf springs on your F-250.
And this is for your truck, if it goes through a lot of heavy towing, a lot of heavy hauling. So, instead of replacing your factory suspension, this is going to work with your existing leaf springs and make them up to 50% stronger. Now, the main reason that someone would consider a system like this is if your truck starts to squat, bounce, sway, or maybe just generally feels less controlled when you are putting on a heavy trailer on your trailer hitch receiver or a substantial load in the bed of your truck. So, when the rear of your truck squats, that's gonna affect more than just how your truck sits. Steering can feel lighter, headlights can point upward, and the truck can become less stable through turns or over uneven roads.
So, this system is designed to reinforce the leaf springs as they're loaded and help keep the movement under control. Now, one of the interesting things about this system is that this is an active mechanical system. It uses variable-rate coil tension springs that are going to work with the factory leaf springs. As the suspension is loaded and the leaf springs try to flatten, this system is going to provide additional resistance and that's gonna help reduce that squat, body roll, sway, bouncing, axle wrap, wheel hop, and bottoming out. But it can also help keep your tires planted more consistently during acceleration and braking.
Now, if you're thinking about this, and then airbags, and comparing the two, one of the biggest differences is gonna be maintenance and adjustment. Airbags are going to give you a lot of adjustability, but you can have air pressure, but you have air pressure to manage. But with this, you set the spring tension during installation, and then you just essentially leave this alone. There's no air lines, no gauges, no compressors, or pressure checks to deal with. Installation is another selling point.
This is gonna be a bolt-on installation. It's going to fit around your factory leaf springs and U-bolt area. And then the. And so you're not going to have to worry about drilling, cutting, or welding, or anything like that. The components are built for long-term exposure underneath the truck. They're made from high-grade steel, alloy steel rather, with the epoxy E-coating. And the end brackets have a salt spray rating of more than 800 hours. A lot of our neighbors tell us that their truck feels more planted. It feels more controlled, particularly while they're towing. Reduced sway, less bouncing or that purposing, better cornering, and less rear end sag are also mentioned to us on a repeated basis. So, it's definitely gonna be something that, once you get this installed, you're going to feel the effects, especially when you start towing heavier trailers or hauling heavier loads. This includes everything that you see here along with instructions. If you are interested in this, but you're not real excited about doing the installation yourself, that's okay because on this product page, underneath the Photos section, we have a link that will take you to our Installer Locator. Click that link, answer the questions that it has for you, and that locator will find an installer in your area that etrailer has partnered with to get this installed for you. So this is going to strengthen the suspension on your F-250, but just keep in mind, this does not actually increase your weight carrying capacity. So, you want to make sure that you're not exceeding Ford's recommended weight limits for your F-250. But I think that's going to wrap up our quick look today. Again, my name is Andy. Thank you for joining me.
Ratings & Reviews
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.
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.
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.
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.
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.
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.
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.
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
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.
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
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.
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.
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.
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!!
Fantastic! Completely changed the way the truck tows. Kinda rides rougher unloaded, but not too bad.
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.
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.
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.
These made such a difference in the ride of my pick up while pulling my enclosed trailer. Let’s squat more stability.
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.
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.
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 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!
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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