This is one weird contraption! They have these things for trucks, tractors, atv's, you name it, it looks like they make tracks for it. http://www.mattracks.com/track-torAssist.jpg
Those are way cool. I'm not sure I want a set up like that but I bet it would be real handy on a lot of occasions. I bet you couldn't roll that tractor if you tried!!!
There was a pickup outfitted with these things at a local county fair last summer. Looked neat but I can't imagine the front end components of the vehicle lasting very long. Also quite pricey as someone else already mentioned /w3tcompact/icons/smile.gif