Bouncing on Concrete Roads

we experienced this last fall driving thru IA on our way to the Black Hills...was towing a 30ft trailer at 7500# (approx 950# on the tongue) with an'02 F350. The bouncing was bad!!! And to make matters worse my wife had a bladder infection at the time. Finally pulled in to a rest stop and cinched up the WD bars one chain link and it helped significantly. Bounce was still there, but we could talk, drink from cups w/o spills and most of all made it easier on my wife.

Just traded the trailer in on a new Grand Design 330RLS 5th wheel that we pick up this weekend so looking forward to see how differently it tows.