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