Ok, I just got a tow rig/ daily driver work truck and need to know how big of tires I can run. It is an '89 extended cab chevy 3/4 ton 4x4. It has the 3 speed auto with 4:10's so it screams on the freeways at 70 mph. I live in Los Angeles and have to drive freeways every day so I need to put taller tires on it to get a better gear ratio. All that said, what is the larges tire I can run without serious rubbing. Will a 32x10.50 rub? If so, how hard is a 3 inch body lift to install?