My relentless pursuit to cure trailer sway - the dancing TT

Not only do you need to scale it to know where your trailer and rig stand for proper WD setup, especially with that much tire, you should have the trailer checked for proper tracking just to make sure the axles are running true. Also, BIG points you don't mention is what diameter and width wheel are you running those 35" tires on, and what ply of tire are they? Running tall, fat tires on a narrow wheel with lots of sidewall makes for really squishy handling and really bad trailing!