Ray,
Are you interested in history? Scenery?
Virginia would be a good interim spot. We have taken US 29 from Greensboro NC north to Charlottesville. That is a good route and will get you west to I81 and avoid cities.
There is a KOA in Charlottesville; we have not stayed there. Anywhere along I81 in Virginia would put you close enough to ride some of the Blue Ridge Parkway and/or Skyline Drive. Gettysburg would be a bit further than half way home. If you have not yet been, you might want to stop and see the Corning Glass Museum.
What is your timeframe? We will know more about another possible campground for you to stop at by the middle of next week. Send me a PM if you want more info.
Kay