Others have probably seen this but it's still pretty cool.
http://www.youtube.com/watch?v=XwpKjEa4LYY
http://www.youtube.com/watch?v=XwpKjEa4LYY
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Link didn't work for me.
I can't find anywhere that states how it attaches to your vehicle??? I see they have a chain hooked as sort of a limiter strap but I can't imagine they rely on gravity alone to hold each track system to the wheel.