265/75/R16 with no rubbing. Thats what Im running on my 97 F150 with no problems. You might even be able to get away with 285/75/R16, I'm thinking about 285s for my truck, and was asking around, and I was told I could getaway with 285s with minimal fender modifications if any. Hope this helped.
2001 Ford F150 XLT 4x4 Offroad 5.4L V8