I don't disagree with 32x11.5's being a good tire size, I just figured the 33's gave *me* what I wanted: no clearance issues, slightly taller (more ground clearance) better mileage, and better performance in shallow puddles, mud, and snow, vs. wider tires.
You look like you've got some room in the rear, but I'm betting my springs will still hit the bumpstops before the rear tire hits the body. Unlike Dodge, Chev didn't feel the need to have gaping rear wheel wells with dinky tires, our trucks just have a lot of room hidden under the sheetmetal. /forums/images/graemlins/smile.gif
We are probably pretty close in the rear looks wise, bottom of my trailer hitch (looks like same hitch as yours) is 16" off the ground, and the axle housing center sections are 8" from the ground.