Yeah, I've seem plenty of track kits for pretty much any utility 4x4. If I really rode that much in the snow, I'd just buy a snowmobile. A moderately powered snowmobile will run circles around even the most powerful 4x4 quad with tracks on it and cost a lot less than the set of tracks. Most of those systems are $4000 or more. You can buy a snowmobile around here in good shape for less than half that. Like this for instance http://stlouis.craigslist.org/snw/5163579367.html