I thought it appropriate to have this guide here as well, and not just rely on OS for it. Please remember... this is a guide. This will not "GUARANTEE" that your setup will require the mods listed in order not to rub. The sizes/mods posted here have all been used by someone at some point.
If you're running a size that is not listed, or know of some sizes and mods required, post it(them). Include what mods you have done to fit those tires. I will update the initial post with all the sizes posted and I will then STICKY this thread once we've got a good guide going.
16"
265/75/16 (31.6") - Suspension Lift + Wheel Spacers + Minor Trimming
17"
255/75/17 (32.1") - Suspension Lift + Wheel Spacers + Some trimming(hammering)
265/70/17 (31.6") - Suspension Lift + Higher Offset Wheels
305/65/17 (32.6") - Suspension Lift + Body Lift + Higher Offset Wheels + Major Trimming