I can give you some spots here in Southern Indiana.
Sycamore Springs
www.sycamorespringspark.com
This place is a favorite. Beautiful quiet setting, and best of all it's FREE. Free 30 amp electric, water fills, free fire wood, free showers, trails, fishing, and all the RV sites are along a creek.
Buffalo Trace Park in Palmyra, IN.
Clifty Falls State Park in Madison, IN.
Spring Mill State Park in Mitchell, IN.
Muskatatuck Park in North Vernon, IN.
Boggs Lake near Washington, IN
Brown County State Park, Brown County IN.
These are all places we have stayed and enjoyed. There are some others we did not enjoy and I have not included them. Have fun!