I saw this the other night and wondered how could it still have drive and one wheel in the air not turning, not hard really, all you need is some (brake) line lockers on the wheels that are on the ground, leave the front hubs unlocked, and in 2WD, once up on two wheels, gently increase pressure on brake pedal, the wheels in the air will be held by the brakes, wheels on the ground unaffected.
The diff?, it gets a bit tricky for the driver here, what happens is the turning wheel will double its speed as the braked wheel stops, that's because all the drive goes thru the planetary gears and . . . . . .well . . . . . . .it just doubles its speed, (too hard to explain) it JUST DOES.
So, I think the bar has been set, i just can't wait till Easter to see who tries to find some mates who will attempt this..
Shane