I went to 15" tires that were taller, not by much, but did hit fabric under TT. It only raised it 1.75" which clears fabric. Had to readjust WDH to compensate. As usual, first adjustment was too high, second was right hieght but had to adjust head angel. Went back to Cat scales. Front fendr now up 1/4 " only 20# OFF front axle. Should work. With 6500# trailer, 1.75" doesn't seem to affect C/G.