I wheeled with that guy (friend of a friend of a friend kinda deal) last year. I wasn't terribly impressed. It honestly didn't work that well. He just crawled over the rock piles (when he could keep his carbed 318 running), but my 3-year old could do that with 2 feet of ground clearance. In the rock garden, he got a huge rock stuck in front of his rear axle and proceeded to drag it about 50 feet, re-arranging other rocks along the way.
The part that bugged me most about him was his driving style. He wasn't all 'gas-n-thrash' or anything, but on the tighter twisty sections of the south loop, he was climbing trees with his rear tires on purpose. He could have made every turn without touching if he would have backed up to line up, but instead he let those massive sliders do their work on the trees. I certainly have no room to criticize anyone's driving style or finesse, but this guy was a tool IMO.
And yes, he FLAT-TOWS it with a 3/4ton (IIRC).