Your weights show the WDH is transferring enough to the steer axle. If it was light by say 200 lbs then it would be a different story.Wouldn’t trailer sway be an indicator that I need a better WDH? The trailer tracks perfect it’s the front of the car that is light and swaying? I just want to make sure before I spend a bunch of money on a new WDH.
i’d start with a higher load rated tire (XL) at max psi and see how that changes your steering feel
WDH should be in the hitch for #3And yes measurement 3 was with the hitch in the car however the bars where in the TT.