Help trip from Ohio to Yellowstone Mount Rushmore Blackhills

We have traveled most of the area you are planning to travel.  Others have suggested some great spots to see. What sites are available is dependent on when you are going. Peak summer months can make it tough to find multiple RV sites along the way. 

We have had success with both the Good Sam trip planner and RV life trip wizard.  We have always traveled by ourselves so have no experience with trying to find sites for multiple rigs.  Best of luck and safe travels.