Wisconson seems to be one of the most difficult states to find auctinos for, I imagine because it's mostly smaller towns with the exception of Milwaukee. I don'tknow this for a fact but I would also assume more smaller independent facilities as opposed to a bunch of chain places like ustoreit, public storage, etc.
I imagine most post their auctins in small local papers that don't get circulated or make it onto other websites or even those sites that list legal notices.
Many places probably have the facility manager conduct the auctions instead of an auctioneer so again less publicised.
Most of the auctions you'll find searching the internet will all be for Milwaukee. You'll probably have to check out local papers legal sections nad or call the facilities directly and try to get on lists. May also check with some local auctioneers. Most probably do farm auctions and stuff but probably have the occasional storage auction as well.