Door County & environs are lovely places. We enjoyed camping in their state parks (and Wisconsin has some very nice ones.) That said, they are very popular, and most sites are reservable up to 11 months in advance - something to keep in mind. There are probably a few sites in Peninsula SP where your rig would fit; Potawatomie, however, will be too tight for you, as I remember. There are several private CGs in that area which might work (we never camped in them.)
On your way up there, if you can get a site in Kohler-Andrae SP (near Sheboygan), there are some there that would accommodate you. Nice park - great place to hang out for a few days & enjoy the beach (Lake Michigan), have a meal at the Kohler Resort, or tour the Kohler (plumbing fixtures) HQ. Kohler-Andrae is VERY popular as well; weekdays will likely be more available than weekends, but do check ahead.
