I seriously doubt if it is a problem with your trailer's suspension. More than likely, your tongue weight is too low. Typically, you need about 12 to 13 percent of the trailer's total weight on the tongue.
Also, do you have an integrated weight distribution/sway control device? Is it adjusted correctly?
Tires on the trailer and the tow vehicle can cause sway problem also.
You need to fill us in with more info.
Ron
PS...it's a Coachmen...not Coachman. Just saying
😉
Ron & Sandie
2013 Tiffin Phaeton 42LH Cummins ISL 400hp
Toad: 2011 GMC Terrain SLT2
Tow Bar: Sterling AT
Toad Brakes: Unified by U.S. Gear
TPMS: Pressure Pro
Member of: GS, FMCA, Allegro
RETIRED!! How sweet it is....