Michigan and Wisconsin are chocked full of State Parks. Every park is completely different from any other, and every campsite is different from the campsite right next to it.
About the biggest sized campsites you'll find in Indiana are at the many State Recreational Areas. These are also run by the state DNR, same as the State Parks. The difference with the State Recreational Area campsites and State Park campsites, is usually the size. The Recreational Areas are usually larger, so they can accommodate both an RV and a water craft at the camp site, and usually multiple cars.
Whereas, State Parks are traditionally smaller sites (depending on the park and the individual campsite of course) and almost always have a restriction of one RV and one other vehicle. Anything else is parked in an overflow area designed for "extra" vehicles.
The best thing you can do is locate a geographical area you'd like to visit, select one of the State Parks in that area, and then make a reservation. You'll need to start with your state DNR (Department of Natural Resources) web site and work from there. Do a Google Search on Michigan State Parks and you'll be blown away.
EVERY person has a different idea of what the "perfect" campsite is. But in time, if you visit enough, you'll soon discover your favorites, know what to look for, and how to get reservations for them.
We've had marvelous sites and terrible sites. But any site is better than spending a day at work!