We have a 32' travel trailer which we pull with a ford e 350 diesel. We have reese sway bars. We have traveled all across the country with no issues. Today we have been swaying like we were on a dance...
I recently felt some abnormal sway on my way home and found the hitch receiver on the truck had a bad weld. The receiver, and ball, were aimed 2-3" toward the passenger side rather than than centered. I guess it was wiggling side to side on the Interstate.