Urgent help needed with Blue Ox Sway Pro swaying

If this is the TV-TT combo you intend to stick with you might try timbrens or air bags on the rear to further improve towing performance. I have towed comfortably at max load before and in addition to the good advice you've received about ensuring the TT was not nose high and the tire pressures were appropriate I found considerable improvement with air bags. Separate left and right lines are best to keep the air from squishing out of one side and into the other on turns, bumps, etc. Happy New Year.