Hummer H2 Sutcan You Fit A Atv In The Bed If I Put A 6" Lift On A Hummer H2 What Are The Biggest Tires I Can Run On It Without Them Rubbing?

If I put a 6" lift on a hummer h2 what are the biggest tires i can run on it without them rubbing? - hummer h2 sutcan you fit a atv in the bed

I have as of 2003 Hummer H2 and would like to deal with a set of 6 "lift the recommended size is the biggest 37x 12.50 tires or can I learn more?