I would suggest two camp grounds in the lower portion of Michigan; they are Poncho's Pond RV park in Ludington MI and Sunny Brook RV resort in South Haven MI. Both are 9 or 10 rated RV park in my opinion with cement pads and full hook-ups and 50 AMP service; with lots to do in the area.
Another suggestion that you may like and a bit different is to take US 10 which enters the state at ST
Paul, Minnesota. This than travels through Wisconsin ending in Manitowoc WI. You will than take the SS BADGER across Lake MI and departing on US 10 in Ludington MI. The SS. Badger is a coal fired car/truck ferry that will take you across the lake.
I have attached a link for you. https://www.ssbadger.com/