This is awsome...What I have learned from being in the bush a ton with quads, and dune buggies, it is all about the ground clearance. Over rocks, logs, through mud holes, tires don't mean as much as the clearance. There is one quad I ride with with almost bald tires, but 16 " of clearance from a lift and large tires, he goes where the rest of us can hardly get to with 12" of clearance and knobby tires, he just puts through and hardly ever gets stuck.
Kevin