Hmm, thast very interesting. I bet they have awesome control. But maybe a little bit too much. The only time I've seen wheels on a sled is at the track. But those are rubber, and are meant only for tar.
My first thoughts on these is: he couldn't afford precision skis to keep front end from darting. Next would throw snow on slides for lube possibly. Gas station bell ringer hoses look out, LOL. Get a carbide wheel and go thru barb wire, and buck brush. Very dangerous, the liability of falling into or stepping on one of these under or above snow Would not be Worth marketing them. I can see recall already, UNLESS they put a top fender on.
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