With a 2" body lift, and the CALMINI lift, I think you can probably get away with up to 245 70 16s with no rubbing. 245 75 16s would probably just rub on the front bumper, but don't quote me on that.
You can quote me. With 2.5" CALMINI lift, AND a 3" CALMINI Body lift, I can fit LT245/75R16 MTs (31"s), but after a LOT of trimming, or should I say:
complete removal of the rocker foo-foo,
removal of the mudflap flares on the rear bumper,
cutting 6" off the bottom of the plastic rear bumper,
removal of the front bumper and installing a high&tight steel bumper.
I still have minor frame AND sway bar rubbing at full lock.
If you want to really use 31"s (and I use my stuff hard), you need 5.5" of lift and copious trimming. Anything larger, you will need an SAS.