I think that the Shenandoah NP doesn't have any hookups. We stayed at Loft Mountain last Memorial Day and it was all Boondocking.
There is a KOA in Harrisonburg that has hook-ups. Heavenly Acres Campground is just north of Standardsville, which is east of the Blue Ridge off Rt. 33. They have full hook-ups. Swift Run Campground is east of Elkton, as you come down off the mountain on the south side of Rt. 33. They have full hook-ups as well, but is not manned all the time.
"THE BAUXITE BUNGALOW"
2004 22' CCD
ex WBCCI# 1430