I've often thought of upgrading (from 31x10.50) to 33x12.50, but then I remember one thing -- my G wouldn't fit in my garage. If one has an ordinary garage, the standard tire'd G barely fits in the door -- at least on my garage, the door allows about 1" of clearance at the roof. With the 2" taller tires, that will result in 1" greater (one radius) height -- and swallow up any margin of error that my door (and it's springs and motor) might need.

A related aside: I've heard that the issue of garage door height (and prospective buyers concerned about their G fitting in the garage) has reached the designers -- and that the next generation G (the so-called MLG) will have a height control (like the Lexus LX-450) to make the G stoop down (as well as rise over trail obstacles) and fit through most garage door openings. Now if their owners would just remember to use it. :-) .