I have a 265 70R17 under mine and I don't see how anything bigger would fit. There is about an inch of clearance on the pan hard bar and it's resting against the hitch.
Bilstein 5100 adjustable front shocks set on the 1.75 notch, Bilstein 5100 matching rear shocks. Moto Metal MO970 17x8 4.5 inch backspace wheels wrapped with Nitto Terra Grappler G2 265 70r17 tires.
Yes they rub on the mud flap as well as the little aero wedge on the bottom of the bumper.