Dragging up old post here but can tell you how I'm doing mine 2015 silverado lt 4x4 crew cab
6" front and rear fiberwerx glass
Had 33x11.50x20 -18 offset which is now being upgraded to 35x12.50x17 -12 offset front glass has been cut back 1½" for clearance no lift just rear block removed to level truck more closely