I've just been checking the snowmobile laws published on the DNR websites for both Wisconsin and Michigan and I see no requirement to have insurance. Furthermore, neither state classifies snowmobiles as a "motor vehicle" requiring insurance (and evidence of insurance) as is required for cars, trucks and motorcycles. I have been stuffing insurance cards into five sleds every year for a long time and its getting to be a pain. Does anyone actually know whether we have to carry proof of insurance on our sleds (or on our person) in WI or MI?