Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
Rough pavement, dips, and potholes can make a trailer bounce and sway. The Roadmaster Comfort Ride Shock Absorbers for Tandem Axle Trailers use heavy-duty, nitrogen-charged gas shocks to tame that motion. Each shock compresses and extends between 11-1/2" and 17-1/2", absorbing road impact through the full range of movement. The result is more stability on the road and less jarring inside the trailer when you hit uneven pavement.
Traditional shocks often sit at a steep angle that limits how well they control motion. Roadmaster’s adjustable brackets let these shocks mount nearly vertical—angled about 15° outward—so they counter both up-and-down and side-to-side movement. That keeps sway under control and helps the trailer track straight, even during sudden lane changes or over rolling terrain.
This system is made specifically for tandem-axle setups using 3-1/2" diameter axles—typical of 8,000-lb applications. It’s engineered to handle the weight those axles carry without being too stiff or too soft, giving consistent damping performance mile after mile.
Everything needed to mount the shocks comes in the kit. The upper brackets bolt to the trailer frame, while the included tie plates with extension pieces replace your existing U-bolt plates. Once installed, the shocks connect between these points to control axle movement. Some drilling is required for the frame brackets, but the bolt-on design keeps setup straightforward.
Each Comfort Ride system goes through rigorous validation, including Finite Element Analysis and real-world durability testing at Navistar’s Proving Grounds. That means every component—from the gas shock absorbers to the brackets and plates—is built to stand up to years of towing stress with dependable performance.
Alternate Instructions
Customer Satisfaction Score:
95% were satisfied with this product
5% of customers were not satisfied
Ratings & Reviews
This is a good kit but no piece of cake to install. You need a nice level slab and your tools close. The workspace is tight and existing suspension bolts are torqued and rusty. I would not attempt this install unless you are fairly mechanical. Parts are of very good quality and engineering and fit are very good. You need a 12” drill bit to install the top bracket. Buy two - there are 16 holes to drill. An electric ratchet is almost a necessity.
Bought this kit to reduce wear on the rv on rough roads. It looks like it should help a lot. I did have sumo springs but had to ditch them. They are not compatible with the new top plate on the spring pack that serves as the bottom mount for the shock.
works well.
Looking forward to first trip and see how much it changes the ride.
Along with the new springs....everything works as advertised. Well satisfied. No complaints.
I had to modify the one set of shock brackets to fit, as I have raised the trailer 5 inches
to match up with the 4 inch raised truck.
Otherwise...no swaying....no bouncing........no problems.
Thanks etrailer for your help.
Installed a year ago, I made a drilling template to help locate the frame mounting bracket screw holes. Installed a set on (2) fivers, spent average of 2.5 hours for total installation per fiver. Helped the ride of the trailer. Would certainly recommend the shock kit.
Just finished installing the Roadmaster shock system on my Momentum 398M tri-axle. The kit arrived well packaged and all items were included. The instructions that come with it are pretty straight forward and easy to understand. This would probably be a lot quicker install with some helping hands, but I did it by myself in about 6 hours. The hardest part of the entire setup is all of the overhead drilling, but with a little redneck ingenuity I was able to make that bearable. As far as this kit goes, the ordering process and the outstanding customer service from Angela W, etrailer.com rocks!! This could be the start of a wonderful relationship..
Huge change in how fifth wheel tows. Don’t feel expansion joints in the road when the trailer goes over them and never find anything moved around inside anymore. RV manufacturers should install shocks at the factory.
One year installed and still helping my suspension. These shocks are amazing. Oklahoma roads are tough on RV suspensions and these shocks help suppress the jumping/bucking of the RV. I highly recommend them.
I installed the Roadmaster slipper spring and shock kits on our 2023 Arctic Wolf 3770SUITE and have been very happy with the ride difference and the much reduced "things moving about inside" while towing compared to what we had with the stock set up. Admittedly the kit is pricey and not for the faint hearted if you plan to install it yourself, but it can absolutely be done and has made a major difference in our set up. The kits are very beefy, clean and quality looking welds and coatings showing the price is not simply good marketing but solid components and attention to QC. We've towed just under 7,000 miles on the new set up so far and it's shown to have been worth the cost and effort installing for me personally. If we were to upgrade or replace this camper I would look to do this again without hesitation. Cost and effort comparisons to full independent suspension set ups and the upgraded equalizer options, which I did have the Road Armor on our lighter bumper pull and felt it was a great upgrade, but for this larger heavier unit I don't think you can find a better sweet spot of cost vs benefits than the full slipper spring and shock kits as this solution offers.
Love the system, I ended up installing it myself and I feel bridge transitions in my truck but not in my camper
The Roadmaster shocks and brackets all appear to be good quality. I say appear, because I haven’t road tested them yet.
The kit is very expensive, considering the shocks individually are not expensive. I considered making my own brackets, but I’m under a tight deadline.
The Axle bracket install is straight forward and relatively simple, because the axles are below the springs.
HOWEVER, the upper brackets are more challenging.
I’ve read on RV group sites that the “self tapping” bolts installed on the chassis top brackets can work loose, causing travelers to use a repair shop and weld them secure.
Self tapping bolts may not be a problem on a chassis that is 1/4” thick steel, but the Grand Design chassis appears to be 10 gauge (1/8”) “C” channel.
I elected to use grade 8 bolts and nuts, which required squeezing my hand into the underbelly covering and installing the washer, nut, and red tread lock from behind.
It’s a real knuckle buster and time consuming, but I feel much better about them not working loose from the constant vibration of the road surface.
BTW, I did consider welding, but there are wires and water pipes all in close proximity to the chassis.
Compression nuts are also possible, but bracket hole alignment must be perfect and I couldn’t do that without first dropping the leaf springs out of the way.
Other than that, I’m pleased with outcome so far.
Thank you for the extra fast service service. Its always a pleasure to do business with you
Helped with the ride in our 5th wheel.
Product came with good instructions and installed exactly as advertised. Haven’t tested it on the road yet. I am going on a trip from Texas to New Mexico. The roads are terrible. Hope this makes the trip easier.
We installed these on our 2022 Riverstone Legacy 39RKFB and without a doubt they have saved us on broken rims (many have this issue) and the ride was an instant upgrade. We drove a 6500-mile trip over the summer to ZION and Rockies and no issues at all. I installed them myself and recommend them as an inexpensive solution to expensive independent suspension.
Game changer! 2023 Alliance 390 MP (big 5th wheel) The ride, handling and "jounce" improvement is night and day different for the better. The stability in severe weather is literally a "life saver", every larger camp trailer should have shocks (dampeners) on it
They arrived when I was supposed to package was very well put together. Instructions were very easy to follow my only suggestion that would be if possible send a 12 inch 5/16 drill bit with would make the job completely easy.
Do you have a question about this Trailer Suspension Part?
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Mark
11/2/2025
This product has performed very well with over 12,000 mixed dirt and road miles. The custom installation I had to come up with because of the torque tube on the Alliance frame with is still very solid and secure. I also Double plated as recommended and had longer U bolts made to accommodate the extra thickness.