Trailer sway can be caused by speeding, weather, or a different route.
RV sway bars are designed to stiffen movement and minimize side-to-side motions, and come in two types: one to attach to the hitch and one to install between the tongue and the hitch.
Invest in a sway bar for high-profile, lightweight campers, but fifth-wheel campers are more stable and less susceptible to fishtailing. Motion control is recommended for remote areas and peace of mind.