Thanks all. They are 215/6516's. Only clearance problems are with my fender liners when cranked hard over because I cut them so they wouldn't get ripped down when driving through water. I just took it to the dunes this weekend and it performed brilliantly. I only aired down to 16 psi and it did just fine. Took it up what seemed like 55 or 60 degree inclines and it didn't even flinch. The quad riders I was with were laughing their butts off that a wagon could to what their quads could. Plus I could fit down most quad trails. I'm uploading the pics here as I type.. should be viewable soon!