RE: North or Northwest of Milwaukee and points north
Harrington beach state park in Port Washington is nice and has large sites. It’s on the lake and Port Washington is a cool smaller town. Further up is kohler andre which is nice as well but the sites are a bit smaller and further from Milwaukee. West of Milwaukee is Ottawa lake campground but if I was going to pick between the two I would stick with Lake Michigan.
RE: Keeping fridge door open while in storage
They make little plastic clips that keep the door ajar yet locked in place. We have been using them for years and the work well.