51% of Michigan is forested and has several thousand CG's total, The state has more than 100 state parks and more than 11,000 inland lakes not including 4 of the 5 huge clean Great Lakes with over 3200 miles of Great Lake's shoreline and gobs of sugar sand golden beaches and 87,000 miles of rivers and streams in the state. West Michigan is beautiful and so much to do and see. Lots of very large high (up to 450 feet high) public sand dunes with beaches and CG's too in West Michigan.
Elkhart is less than 10 miles south of the Nichigan border so it's really close and are so are vast numbers of state, county private owned, etc CG's for you. East side of the state and the west side of the state are apples to oranges diferent. The Upper peninsula is very different form the Lower Peninsula also.
Camping, boating, and fishing for so many very big and small good eating fish is a way of life in Michigan. Walleye, laketrout, salmon, great eating mild tasting lake perch, bass, and so many others. So much to do and see in the state that you'll always have new places to camp and explore each long weekend for the rest of your life.
Elkhart is 110 miles south of where we live and have for over 77 years on the Lake Michigan shoreline and have RV'd for 55 years so far and we also go down to northern Indiana a few times each year. Elkhart area is where 65-to 70% of all the RV's are made in North America and shipped all over.
Indiana is largly a farming state but does have a lot of CG's spread out arond the state. Lots of very nice ones too.
Your problem will be not finding a CG you desire but which one as there are so many. By count, there's more for you to chose from than all the CG's in SC, NC, TN, and GA combined and then some. Just our local less than 10 mile semi circle radius area has 12 CG's now and another big one is about ready to start building.