If I recall correctly the Hummers were allowed to run the courses, but not allowed to compete points wise for the actual Trophy due to their tire size.
I can't reiterate this enough, don't let your vehicle choice keep you from trying this. It was a great time.
7.3 Super Duty, 4X4, Ext Cab Shortbed, 6 Spd Manual. Hawk FWC
2006 Jeep Unlimited
Lexus is250 AWD (Hers)
1980 HJ45 Diesel LBP (Sold to some dude in Utah)
1984 Troopy, ExPo White (Sold to the same dude in Utah that bought my other dream truck)
Kimberly Kamper (Sold to the Toyota Shaman)