Wisconsin state parks are great! If you can find any sites with hookups (usually just electric in SPs there) available along your route, you will probably find you enjoy your stay there. We haven't been to the parks that far north though so can't advise specifically.
We did stay in a few state parks in the U.P. (Michigan), though, and liked McLain SP and Indian Lake SP - we stayed at both units, and though the west unit is less well-appointed, we thought it was prettier. We liked the Eagle RIver (WI) KOA just west of the U.P., private CG in the woods with hookups.
If you will be going across the U.P. and like river traffic, you might enjoy Aune-Osborn Park in Sault Ste Marie. The CG isn't much, a flat plain with camper pads pretty close together, but it's a real kick watching lake freighters glide by RIGHT NEXT to the CG.
We loved the Lake Placid/Whiteface Mt KOA in the Adirondacks of NY. Nice & wooded, and I bet it's just gorgeous in the fall. (We were there in late summer.)
2020 Toyota Tundra CrewMax 5.7L V8 w/ tow pkg, Equal-i-zer
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