I'm not sure about the ATV's , but I have used tracks on a side by side , and I was not impressed at all . For work we set a Ranger up with tracks , and it couldn't even compare with a snow mobile . The tracks where very expensive and added a lot of weight . The problem I saw with the weight was the Ranger would just sink in powder .
To be fair the tracks worked ok on hard packed or groomed trails . On the side by side the tracks did make steering a lot harder , so that may be a issue on a wheeler .