[Wavery]

Another consideration may be the distance between the front of the front tire and the frame member as well as the distance between the rear of the rear tire and the rear frame member. However, the tire never touched that frame in the next thousand miles that we had it.

My 1998 2720 had the square wheel wells and after I added the 15" tires, I had 1/8" between the front of the tire and the front of the frame member.

Have you considered going with load range "E" 14" tires?