The supers use maxx size wheels and tires and have a wheelbase of 14-18 inches usually. The 2.2 class rigs have a max wheelbase of 12.5 inches, have 2.2 wheels and tires, and no rear steer is allowed. Rear steer isn't needed with the short wheelbase anyway, and front dig offers a much tighter turning radius than rear steer does.
The reason that his rig was handling stuff like it was is because it's properly dialed in. The 2.2 rigs will blow you away at the obstacles they can climb just as well. Once you start crawling you learn the balance points of your rig and push it to the absoulte edge and beyond. To me thats why crawling is so much fin. You get just as big of a rush of adrenaline crawling as you do going around a track at 60 mph, but its also relaxing at the same time, and you can do it while holding your beer and sitting in a lawnchair on the back porch.
That video also shows the use of front and rear dig really good. Mr. Clean, if you watch his rig crawling, watch how the front and rear wheels are controlled independently of each other. That's a BIG part of why the rig can crawl like it does, and thats why dig is mandatory in a comp rig. Also, he's running a very low COG. That low COG is why the Axials are being phased out for Berg type rigs on the comp circuit.
. Nicely done Video too, and great background music - can't beat a bit of Faithless 
