I have a '99 F-350 c/c 4x4 dually and would like to put taller tires on. Has 235/85-16's now at 31" tall but I want taller. I was told I could use 285/75-16's (33" tall) with a 2" spacer between the wheels but would 315/75-16's (35 tall) fit with the spacer? Have a 3" lift for the front also. Has anyone done this? Any suggestions? Thanks.