I just did my '00 'burb a couple weeks ago- keys in front with +2" shocks- very important for maintaining a decent ride, Firestone bags in rear, Bilsteins all around, and 285/70-17s on H2 wheels. It is barely touching the lower tip of the front air dam when hard turned and a dip- like driveway entry. However, I am 2500 4x4 to clarify, with 6.0. Kinda wish I did the 255/80s but wanted to try these new Cooper S/T Maxx and they are not available yet in that size. The S/T Maxx's are great by the way- certainly worth a look, and E rated to boot, though you may not need on 1/2T...