those were tested here in Nova Scotia some years ago.
they didnt do to well,seems we only have rocks and swamps...imagine mowing our lawns.ha ha.
they use ones with tracks like an excavator now  here and some with 8 tires.
later chris
craftsman 10/28 snowblower with tracks   husky 372xpg chainsaw   sachs dolmar bc212 bushsaw   mondo trimmer   monster tractor with trailer    cheep wheelbarro and couple shovels and a partridge in a pear tree