Before any lifting whatsoever, I mean stock struts/shocks, I ran 245/70/16 BFG A/T's for 40K miles. They'd hit the rear fenders over speed bumps, but I didn't really care. Oh, and they rubbed the front frame at full-lock. A saw took care of the plastic fender interference.
Since then, I've gone to 225/75's, and I like it better. Less wandering on freeway ruts and, in theory, better snow/ice traction. I also went to KYB's front and rear which eliminated the front tires smacking the liners at full compression and I've not heard a peep from the rear wheel wells. I did add about 1.5 inches of Jeep TJ spacers to the tops of the rear coils, though it was to counter the 'nose up' look the GV always had, in my eye. It was worse after the KYB struts as those tweaked the front end enough I had to add adjustable camber bolts to keep tire wear normal.
There is a girl in Singapore who claims to be running 33"-ers on her GV. I've yet to see pics, though I've asked for 'em.