Recommended Suspension Upgrade to Fight Sway on a Tandem Axle Trailer w/ 3,500 lbs Axles

Updated 10/31/2024 | Published 10/29/2024

Products Featured in This Question

Roadmaster Comfort Ride Shock Absorbers for Tandem Axle Trailers - 3,500-lb Axle

(186)

$725.00

SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Underslung

(65)

$299.99

Question:

We have a 92 Sierra by Cobra fifth wheel we’ve been upgrading with E Trailer’s help. 7k lb, tandem 3500 lb axles mounted above springs. We’ve replaced springs, Moryde wet bolts, and equalizer. If I change lanes too fast, the trailer rocks back and forth violently. Would the shock absorbing kit, and/ or cushioned equalizer help? I read that the Lippert kit won’t work on axles above the springs, and the Roadmaster kit might be damaged if there’s a flat tire. Any help would be appreciated! The trailer has been garaged all its life, and not many miles on it!

asked by: Carl N

92 Sierra by Cobra
(click to enlarge)

Expert Reply:

Hey Carl welcome back! Out of those options, I would recommend going with the Roadmaster Comfort Ride Shock Absorbers item # RM-2450. These would definitely add quite a bit of lateral stability and overall improve your towing experience. You run the risk of damaging a number of components if you blow a tire. That's just part of the fun of towing. I do not think a cushioned equalizer is going to improve the violent swaying you're encountering.

Another option is to install the SumoSprings Trailer Helper Springs item # TSS-106-40, you were looking at. These also provide lateral support and work aggressively to address sway. They work independently from side to side which helps that back and forth feeling.

I have linked review videos below for both systems so you can see their features demonstrated.

expert reply by: Jerred H

Carl

10/30/2024

Hi Jerred, thank you for your help again! Would the shock absorbers be the best option for me? The other question is, would two of the Rm2450-50 kits be the same as the Rm2450 kit?

Jerred H.

10/31/2024

@Carl Yes, I do think the Roadmaster Comfort Ride Shock Absorbers item # RM-2450 are your best option. The Roadmaster Comfort Ride Add-On Kit for Triple Axle Trailers item # RM-2450-50 doesn't have all of the brackets that item # RM-2450 comes with.