Most Michigan state parks were designed over 50 years ago when tents were the norm. Electric but no water or sewer. Some, a few, have been updated to include full hookups but most remain as originally designed. You can go online, put in the specs for your MH and find a site that will accommodate your MH and reserve it. You can also see pics of the site.
Still they are small and pretty crowded during the summer months. On the other hand most sit on some of the most prime real-estate in the state sitting on the shores of the Great lakes and inland lakes.
Private campgrounds, different story. Full hookups but you won't be sitting under 40' pine trees. There are nice state and private campgrounds, you just need to do a little research.