My 2 cents...
Tracks on a quad pale in comparison to the effectiveness of an actual snowmobile in snow. Quad provides very little flotation with tracks, has to work way harder than expected to turn the tracks, and on top of all that a set of good tracks is far from cheap.
Enough other responses are bang-on with the recommendations of great sled alternatives. I would highly recommend the Polaris Indy line of sleds -- we've had them for years growing up. My uncle still has a '94 Trail Deluxe that runs like a Swiss watch.
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