Yep, that's the first thing to check is the ball height truck vs trailer. The trailer load will shift to the rear if the tongue is to high, especially on a single axle. Trailer and boat must be level.Fish hawk said:I had a sway problem with my pop up camper for a few years. I checked the tongue weight a few times and it was where it should be but it continued to sway. Turned out to be the hitch ball was mounted to high. I switch to an 8" drop hitch mount and the sway disappeared.