The Blue Ridge Parkway app has info on camping, hiking, etc. Crosses the Appalachian trail many times. Same for Skyline drive in the Shenandoah NP.
https://www.nps.gov/shen/planyourvisit/index.htm
BE AWARE OF HEIGHT RESTRICTIONS along Skyline drive and Blue ridge Parkway. There are a couple of tunnels. The entrances on Skyline drive at the gates has overhead to prevent too tall vehicles. Hard to see in the picture but I think it was 12' 8" ??? Double check online.
We drove it without the RV. Beautiful drive.