Matt - Thanks, man! These are great trucks, and the tire swap just makes them better. Much more capable on, and especially off road.
Tnguyen - 235 is the tread width measurement, 75 is the sidewall height, and 15 is the wheel diameter. The difference between 75 and 70 is just sidewall height, with the 70 being a little shorter.
Hammer - Looking forward to seeing your '12.
Gabass - Check out my earlier front tire pic... the black box mod removes the "bulge" sticking out in the wheelwell... near the bottom at the rear where it's close to the tire during a turn. 235's are about 29" tall, with the black box mod I hear you can fit 30 x 9.50 tires.
Another one of my truck with the 235's.