Monitor the water level in the battery monthly and refill with demin water. Deal with the battery or deal with burned out 12v control boards. You could also just upgrade the converter/charger, but even then you still have to monitor battery electrolyte levels.
Say you're coming out of the Chicago area.
About 2 hours out puts you in South Haven. Sunnybrook is a good rv park just east of town. A number of things to see and do in the area including beaches, blueberries, SH shops, Saugatuck shops, Grand Rapids, etc.
I-94 between Chicago and Detroit is my least favorite road. Numerous big trucks and commuters who think 80 mph is slow. Its also a rough road. If coming from the South and don't have to do Chicago, then I like US-31 out of Indianapolis. Along that route just SW of South Bend, IN you will find Potato Creek State Park. I can't speak for Indiana, but Michigan State Parks are difficult to get into. Plan well in advance for those.