Thanks for the tip Bill.
I run 265 75 R 16 on my truck and the sidewall has a max pressure of 35psi. I inflate truck tires to specs on the sidewalls. However I have 205 70 R 14 on the trailer that has a max pressure of 65 psi in which I inflated to 55 psi for a softer trailer ride. The trailer had nothing in it on the way to the State Park, and about 40lbs more on the way home. On the way home it tracked a little better ? I think that maybe the Axle is out of Square (tow in on one side tow out on the other) ? I will measure a center line and out to each tire to see. Just a thought.