I found 4 7.5 x 20 mounted with new rubber and 4 9.00 x 20 mounted with 80% rubber. I was thinking of the 9.00s on the rear (more speed) and 2 7.5s on the front. They measure 3" difference in height so the question is will this pitch the truck to far down in the front (look stupid)? The 9.00s are not military tread and they are 10 ply.