Deerman: here is what I sent in reply to member Trebz recently.
"Trebz: For reference, I did the add a leaf, which added 2" over stock height (measured at the front bumper).
Im running 255/85 (33" tall, fairly narrow) on the stock rims with 1.5" spacers. No rubbing at full turn left / right (with one front wheel on a 6" curb, the other on the street). That is after the turning radius adjust.
Hoping this helps."
You can probably search the forum for any "255/85" or "255 tire" references and get some hits.