I europe the xlts come with 255/70-16s stock, witch would be 10.03 inches wide and 30.1 inches tall(diameter).
My '96 actually DO rub a little bit under full compression(like when I go over a ditch and have more or less only left front and right rear on the ground), but only then.. I have no lift and no trimming at all(you can take a look at my pics to see how it looks)