Customer Reviews

2015 4x4 XLT 2.7 Ecoboost. Makes truck sit and ride better. Smooth pulling my camper, no more squat.

Steven R. 5/5 Verified June 18, 2026

Just got a new tow vehicle 2026 Silverado 1500 RST Z71. Picked up the RAS 5611-TZHD to help with the rear squat while towing. Just got home from a 500 mile trip towing my camper and it handled like a dream. I love worry free towing! The install was super easy and videos from others were excellent. I installed the pair in about 45 minutes. I highly recommend it to anyone on the fence.

John B. 5/5 Verified June 8, 2026

Nissan Titan XD. Installed the kit after my son recommended it. I usually tow a 6000 pound trailer and having the extra preload has stop the porpoise effect and gave me a more solid towing experience.

Richard B. 5/5 Verified June 16, 2026

2011 Toyota Tundra Double Cab 2WD Using the 25% tension spacer, I gained 1" of rear lift, when combined with the Eibach Stage 2 rear shocks, the lift totaled 1.75". Having tested the system both without load and under load, I can verify a few things. Unloaded, the ride quality is only improved. No notable extra stiffness in ride, but definite improvement in bump compliance and cornering. The difference in braking response alone is night and day. You may not realize just how much axle wrap is occurring when braking without this system, but you will certainly notice after installation. Loaded under approximately 3-4k lbs, which would previously have left my rear end sagging by 1-2", there is now no noticble sag at all. Possibly 1/4". If I planned on hauling upwards of 7-8k lbs regularly, I would increase the tension to 40%. Installation was a breeze. Quick rundown: 1. Floor jack 2 Jack stands 3. Remove wheels 4. Unbolt rear shackles 5. Install RAS 6. Reinstall rear shackles 7. Dial in tension with included spacer(s) 8. Reinstall wheels It could reasonably be done in about 45 minutes, but expect closer to a few hours if you aren't experienced in working on suspension. Easily installed by anyone with the want to do so. 10/10 product. Works exactly as advertised and will most likely serve most people better than helper springs or thicker leaf packs for most applications. It should honestly come factory installed on any truck with leaf springs.

Jesse C. 5/5 Verified June 13, 2026

Easy installation and the first drive I took I immediately noticed my truck rode smoother and the body sway was gone on curves. My RAS is set at 40 % and my truck is 4.5” higher in the rear than it was previously. I love it and my truck is a 2025 GMC 2500 AT4 4x4!

Robert B. 5/5 Verified June 16, 2026

The truck I installed these on, is an 06 GMC Sierra 1500. The truck only has 100k on it for mileage and is in very nice shape, however it's a 20 year old truck, and the leafs were getting kind of weak. I added the RAS to help with that, as well as to help when pulling my trailer with tractor. As you can see in the pictures, the ride height is very noticable between the two pictures with the trailer hooked up. The height did increase by about 1.5 inches unloaded. But the ride is most definitely worth it. Night and day difference when pulling, almost eliminated the common "porpoising" with pulling a bumper pull trailer. And much to my surprise, the unloaded ride is amazing, you almost don't even notice most bumps when the rear of the truck passes over them!!! This is set on the 20% setting.

Chris S. 5/5 Verified June 13, 2026

Second truck I’ve run the RAS on. Works great even if not towing or loaded with something. Pretty easy install that can be done in few hours

Shawn P. 5/5 Verified June 12, 2026

2018 GMC Sierra 1500 I tow a 20 foot boat. Any divot or bump in the road causes the truck to bounce dramatically and would bottom out on the bumpers. Before RAS I installed Bilstien 5100 rear shocks which helped with the rebound, it still bounce dramatically but was a smoother ride. With the RAS 4611-HD it has improved the bounce where it’s even a lot more comfortable, the truck doesn’t bottom out on the bumpers, the truck doesn’t squat nearly what it did, and it feels a lot more planted to the ground. The RAS system did raise the rear end up 1.5inches which I’m am not mad about at all. I’m so glad I went with the 4611-HD vs the standard strength.

Jacob R. 5/5 Verified June 9, 2026

2025 chevy 1500 ZR2 3.0. Installation is pretty straight forward. It adds an inch or 2 in height when unloaded to the back end but with my 7200 pound trailer on it sits perfectly level. Really doesn't affect ride when unloaded, if anything feels more planted. It did exactly what I wanted for an amazingly fair price. I really couldn't be happier!

Tim S. 5/5 Verified June 15, 2026

I put this in to help tow my 36’ travel trailer camper. I have a 3/4 ton truck that squat a bit with this not in and I could feel it in the steering when driving with the camper. Not only did this system help with my camper pulling experience but also with my daily driving! I have it at 50% increase and I notice everything from smoother driving to better steering control! I love this and am so glad I put it on!

Ethyn B. 5/5 Verified June 12, 2026

Just got back from a 250 mile trip and they made it so much more comfortable!! May need to make some minor adjustments, but I am very pleased with the results.

Brad M. 5/5 Verified May 18, 2026

Towing and everyday driving feels way better and no more bottoming out. Even driving on windy roads feel more controlled now.

Edward B. 5/5 Verified June 7, 2026

What a wonderful piece of engineering. After upgrading front and rear suspension, I still felt that the rear end of my 2008 Sierra was still too soft for the tandem axle trailer I tow frequently. I also lost the rake I had with stock suspension. This RAS kit was the right way to go, I gained 1.25" of rear lift and the ride is exponentially better than before. Now the truck doesn't squat with the trailer and I have the rake I was looking for, without changing any of the rear suspension components. 10/10, extremely satisfied

Adam H. 5/5 Verified June 10, 2026

2022 Ford F250 7.3 gas. Immediate change for better towing.

Tim C. 5/5 Verified June 14, 2026

I believe it took 45-50 minutes to install, easy as others have mentioned. It added about an inch in lift in the back “.875”.

Bernie B. 5/5 Verified June 14, 2026

2025 gmc 1500 Denali, very happy with the ride and improvement in towing! It the 3rd pickup I've installed RAS on. All 3 are performing great!

Anthony C. 5/5 Verified June 7, 2026

Took longer to prepare for the install than the actually install. Softened the unloaded ride a lot. Haven’t towed with it yet

Allen R. 5/5 Verified June 7, 2026

Bought this product help from sagging on back bed. Work perfect when cap is on. Also helps out when towing. At first the price seemed high. No wast of money they really work. Im 78 put them on my self no problem.

Thomas H G. 5/5 Verified May 10, 2026

2001 Toyota tundra 4.7 L V8, 2 Wheel Dr. made an eighth 10 pick up truck into a half ton pick up truck, I needed it years ago handles much better on curves and corners. Still rides like a dream!

Cary K. 5/5 Verified June 2, 2026

600 lb of tools and 20 foot Sea Hunt boat, truck sit level with no effect on empty ride

Robert P. 5/5 Verified May 31, 2026

I use my 2020 Ford F250 Super Duty to pull a skid steer trailer and a travel trailer, both with 1800# of tongue weight. This weight, plus some cargo in the truck bed caused significant rear suspension sag. The RAS HD kit solved the problem. No more rear sag or headlights shining up into the sky.

Brandon E. 5/5 Verified May 25, 2026

2025 Ford F250 King Ranch. I haul a 12,000# 5th wheel camper that almost maxes out the payload of the truck. The stock leaf spring squat 4 inches and it would porpoise with dips in the road. The squat is now about 2 inches and the front is not pointing up. The porpoising was greatly reduced. The empty ride was also improved and with the coil spring's natuaral behavior, it does not feel rough. I installed the mega spring version because my traler's heavy weight and nearly maxed out pin weight of my truck. They are not cheap, but cost much less than switching to a 1-ton truck.

Anthony B. 5/5 Verified June 21, 2026

After pulling tractor before RAS and now squat is gone. Researched air and springs and completely glad I chose RAS. Install was easy. I would put this on any other truck hauling equipment. Thanks for great product

Jeffery S. 5/5 Verified May 20, 2026

Installed on my 23 Silverado 1500 ZR2, and so for it is doing everything it claims. Easy installation, eliminated the sag from the rooftop tent on the truck and seems to have helped the sway. Have not put many miles on the truck yet and no off roading, so still a little early for review but all good so far

Colen S. 5/5 Verified June 10, 2026

I installed this to reduce suspension squat on my 2023 f150 tremor truck while towing my forest river wildwood fsx 260rt toy hauler camper. It raised my truck 2-3 inches in ba k with no load but definitely reduced suspension squat with the camper in tow. Wish I'd measured the difference. What i didn't expect is it improving the cornering ability of the truck unloaded! It reduced body lean when rounding corners; be aware of this or you may dump.a passengers drink like I did. RAS is a great product!

James M. 5/5 Verified June 17, 2026

Easy to install improved ride and handling with a 800 pound tongue weight camper

Daniel B. 5/5 Verified June 17, 2026

I’ve got a 2009 F-150 with 145k miles that I purchased new. We started pulling a travel trailer 4 years ago and replaced most of the most key suspension elements to get a better, and safer tow. I added a fiberglass camper shell last year which changed the dynamic since I was adding weight to the bed top causing an exaggerated sway. Fortunately, I reached out to a couple of F-150 forums on FB about this and they universally recommended RAS. The Ford F-150 (4WD) 2009 - 2014 HD Kit I purchased was easy to install and I can already feel the difference. We’ll be going on a camping trip tomorrow and I’ll be able to assess the entire install at work.

David A. 5/5 Verified May 25, 2026

I love my HD RAS on my 2021 Nissan Titan XD install was super easy and made the truck ride even better. The product does exactly as advertised.

Elias M. 5/5 Verified June 9, 2026

I have a 2022 F250 king ranch diesel. I was a bit skeptical but really want to get rid of that cement freeway bounce. Although it’s still a truck, but this kit is amazing. It almost rides like a Cadillac Escalade now. Towed my 24 foot trailer with a classic car inside and I almost forgot it was behind me. A truly satisfied customer.

Patrick D. 5/5 Verified May 13, 2026

2011 F250 with 6.7 Powerstroke. Truck wobbled on large loads before RAS. Put on the HD kit reducing squat/sag by 2” and then pulled 11,000lbs over a 26-hour drive. It was a drastic, positive change and I felt much more control over my load on rural areas and mountains where highways have dips and curves.

Christopher D. 5/5 Verified June 4, 2026

2022 Tacoma. Lifted 3”. Had airbags in the rear and just destroyed my ride quality. I will put these on any truck I own in the future. I love the ride quality. The responsiveness and the fixed rear sag.

Cameron R. 5/5 Verified May 9, 2026

It looks intimidating to install but literally took no more than a hour. My 2025 chevy 2500 rides way better pulling my 8k lb camper since I installed my RAS kit. Eliminated the body roll and bounce while towing.

Christopher J. 5/5 Verified May 11, 2026

Installed on 2024 F250 4x4. It did raise the back end up about 1- 1/4" with white disc setting. Took about 45 minutes to install, adjust and test. Latched onto my Jayco Eagle 30CRT and both sit perfectly level. Drives better while towing. Going across road to bridge transitions much smoother. I absolutely didn't make a mistake with this purchase.

Richard O. 5/5 Verified May 10, 2026

I bought this to firm up my 2025 F150 Tremor while towing heavy. So far I’m very happy with the product. Only problem and I knew this was going to happen, I put a 2.5” leveling kit on my Tremor but with the RAS, I’m back up 1.5” using the white adjustment spacer. I knew it was going to and I’m still happy with the look. Another plus, I can be pretty heavy footed in the corners and curves, my truck now has much less roll while cornering. Rear end stays planted similar to using a traction bar. If you purchase a RAS just know that it will lift the rear 1.5 to 2” depending on which setting you decide to adjust to.

Bret A. 4/5 Verified June 17, 2026

Excellent upgrade to the standard rear suspension on my 2024 Ford Ranger. When towing, it reduced squat and smoothed out the road. When not towing, the ride is so solid and positive, especially on curves at highway speeds. I purchased kit #4515 R.

William F. 5/5 Verified June 9, 2026

Pulling a 41 foot fifth wheel and the RAS has improved an already capable vehicle. By far the easiest suspension upgrade I’ve ever installed and it out performs anything I’ve experienced. The best part is unloaded characteristics and handling are not negatively impacted like air bags and springs swaps. The hitch weight squat is improved and the rough road porpoising is virtually eliminated. I’m so impressed with the quality, and ride improvement. Honestly I don’t know why the manufacturers of tow capable trucks don’t incorporate this technology in their vehicles. If you’re towing a light trailer you will see some improvement and if you’re towing anything over 10,000 pounds you should have this system. Sway, squat and porpoising are the challenges of towing heavy and large trailers. Especially if your load weighs change regularly. I wanted to get some miles on the truck before reviewing and the more I drive the happier I am with the RAS.

Grant J. 5/5 Verified April 28, 2026

Installed these in about 45 minutes without removing the tires. Just made sure to jack truck up far enough to get jack stands under frame instead of front leaf spring holder. Was an immediate improvement of how the truck handles the roads and curves. Rear end is much stiffer than expected or would like even at the lowest adjustment disk (white) but that’s ok. Bridges and rough roads definitely feel more planted and controlled. I haven’t towed anything but I got these for future jobs since I wanted traction bars anyways. Solves the issue of needing traction bars air bags or a sway bar in the rear for handling!!!! Ford F-150 (2WD) 2015 - 2025 HD Kit

Anthony J. 5/5 Verified May 4, 2026

Put on my 2015 silverado 1500 with rocky ridge addition. HD kit, big improvement in over all handling with or without trailer. Did not effect ride when unloaded, too my surprise. Even made it better. Pull 16 enclosed trailer daily. Even out the small squat that I had. Highly recommend

Bruce O. 5/5 Verified May 26, 2026

Immediately made a distinct positive difference in the ride of my 3” lifted 2020 Tacoma. If feels more smooth and stable and drives like when it was brand new.

Michael S. 5/5 Verified June 10, 2026

My new boat and trailer were causing significant sag during trailering. I added the RAS to the truck and saw over 2 inch improvement to the truck.

Max L. 5/5 Verified April 29, 2026