Well. East of WI... Is Upper Michigan (I like to promote MI)
Tahquamenon Falls State Park Just west of Paradise, MI. is one place you should stop.. Now I do not know if your rig will fit in the state park, Last time I was there (long ago) I think they offered 20/30 amp electric, luggable water and a dump station... But there are private campgrounds just down the road (Alas, KOA affilates I think,, KOA = KEEP ON ADDING to the price).
I have also stopped in a little county park in Grand Maris. Eastern end of Pictured Rocks National lake shore.. Now I know there are some other state parks and/or other parks between there and the eastern end, but you need to be on the eastern end to hop on a boat for a tour. Been there too.
Going south, via I-75 you come to Big Lake State park in Indian River
Sharing a line fence with the state park and in days of old a stairway connected (no longer thanks to idiots, no not governmental idiots but citizen idiots) with the park is a shrine to the Catholic Church's only Native American Saint from Michigan.. A 17th century Mohawk Kateri Tekakwitha (been there too, but then I am a Catholic boy).
Continuing south we come to Hartwick Pines state park,, I think they will have sites that can hold you (I think big lake will too, only one I'm not sure of is the falls) This is a park that pays homage to the lumber industry, it includes a stand of virgin pine, and a lumber camp. Used to have a park interpreter (One of the folks called rangers) who was fantastic, This man very likely knows more about logging industry and lore than any other human alive today. But when last I was there he told me they were eliminating his position and "Permoting" him to assistant manager (Again long ago).
From there south I can't help you much other than to suggest a stop at a little town called Frankenmuth. There is a private campground there. Also General Trailer Birch Run store, and one of the larger outlet malls.
(Birch Run is just, and I mean JUST south of Frankenmuth) This town is worth a visit.. The Always Christmas store is there, along with a very nice main street.. Yes, the town is a tourist trap.
From there you are an easy couple hours to Detroit, and can easily make Ohio and a left turn before the setting of the sun. Once you cross to Ohio.. Well, Cedar point might be worth a day or two for the kids. NOTE: When I went to the point last I stayed at a campground (Fort Firelands) East of Sandusky, Came in on Route 2. and listened to the radio tell me all about the backup getting into the park.... Of course when I finally got to that long line of cars.... I was about 3 from the ticket booth.. they were all behind me.. Just the way the traffic is routed.
But again, been many years.. All these trips were in my PUP days, then I got a trailer then, nearly a decade ago, this class A.
Home is where I park it!