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.
So you want AWD becuase conditions might change and you may not recognize the need to put the vehicle into 4WD? If conditions warrant it, flipping the switch at most any speed into 4WD for any of today's trucks is easy to accomplish. Honestly though, my tow experience in 4WD is limited to slippery/hilly situations for parking or retrieving the trailer from the campsite. If it wasn't for my work, I would not have a 4x4 truck for towing.
I've searched the MCL (Michigan Compiled Laws) database, the rules for campground/rv resort development and operation from the DEQ/Public Health Department and can find no State of Michigan law prohibiting removal of truck camper from the truck at a public or private campground.
But, I do remember a trip just a few years ago to a former rv park turned campground and was told I could not park my motorhome at an angle because of fire code. I suspect if there is such a prohibition on truck campers, it comes down to an individual location, in a specific jurisdiction where they are interpreting very stringently NFPA 1194 which has a paragraph talking about designing sites/campgrounds/rv parks for the safe and efficient placement/removal of camping units.