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When towing or hauling, sag and sway can throw off your handling fast. The RoadActive Suspension Custom Leaf Spring Enhancement Kit adds up to 2,000 lbs of support by turning your factory leaf springs into a mechanically active suspension system. The variable-rated coil tension springs automatically adjust to your load to keep the truck level and stable while you’re pulling a trailer or carrying gear. That means steadier steering, better braking control, and less rear-end squat when the weight piles on.

Heavy loads can cause sway or body roll in corners and on windy highways. The RAS kit’s variable-rated coil tension springs react instantly to weight transfer, reinforcing your leaf springs before sag or sway takes over. This active design stops body roll and trailer swing from starting in the first place, so you feel more planted through turns and crosswinds. No waiting for air pressure or hydraulics to catch up—just steady, predictable control every time you tow or haul.

Under hard acceleration or heavy payloads, axle wrap and wheel hop can beat up your suspension and make traction sketchy. This system stabilizes the leaf springs by absorbing the force that causes them to twist. That keeps the tires planted, eliminates wheel hop, and helps extend the life of your leaf springs, shocks, shackles, and tires. It’s a simple fix that makes the whole setup feel tighter and more controlled under load.

The RAS2611 kit comes fully assembled for easy bolt-on mounting—no drilling, cutting, or welding required. Once installed and adjusted for your setup, it automatically engages when loaded and disengages when unloaded, keeping ride comfort close to stock without needing constant maintenance. The epoxy e-coated steel construction with corrosion-resistant brackets (salt spray rated for more than 800 hours) means it’s built to handle real work in all weather without giving you extra chores down the road.

Ratings & Reviews

Matt
1/16/2023
After a year, Im extremely happy with this modification. I have thousands of miles towing a travel trailer and the improvement is great. I still say three stars just due to the complex install.

Jenny N.
4/15/2022
I reached out to the manufacturer about the rough ride that you have experienced. They did have a suggestion to make. It seems like that the system is adjusted to the 2 mm on the black shim. You can reduce the tension to 1-1.5 mm gap between the coils then it will help achieve a softer ride. You will want to raise the rear of the truck in the air and then leave the axle handing free. Using a dime as a gauge to redusce the gap between the coil springs. The adjustment can be done, with only one side in the air at a time.

Brian
12/5/2022
It works great. Can hook my rv up and drive without worrying about truck sag. Great product.

Mike L.
6/23/2026
Nicely done, Sam! Thanks for the photos, we always appreciate those!

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.

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?

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?

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.

Miguel
7/10/2022
Its been working very well i loaded a couple of times and its awesome

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.

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.

William
3/30/2021
Makes the ride a little stiffer but its a truck. Great when pulling my 37 camper. Helps out a lot!!!!

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!
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Jenny N.
1/17/2022
I reached out to the manufacturer about the installation. I found that while all other GMC 1500s are able to use the 4611 easy install bracket, the kits for the 2015-2018 GMC 1500 Denalis are one the few applications where the 4611 kit can not be used and the axle must be ped for the install.