Best RV Campgrounds w/in 5 hour drive from Indy?

Indiana's state parks are, as a rule, outstanding. From your note, I'd suggest Turkey Run State Park. Some of the best hiking in the state, and 'a river runs through it'. Suggest you fill up your FW tank before you go, though. The water over there is heavy on the sulfur. Took us weeks to get the odor flushed out of the lines... especially the hot water tank.