Just returned from our second trip to Fl. via this route. I think I can shed some light on this. First, you have several choices. In W.Va. there is a campground in Ripley open year round. Not great but OK for a one nighter. Full hookups. There is another in Beckley. Never stayed there but heard it was Ok for a one nighter. Did stay one night in Camp Creek state park close to the border of W.Va. and Virginia. Really nice place in the Summer but would not recommend in the winter or early spring. No water, no showers, no people, no cell phone service, one TV station....only electric, mountains, trees and bears. This place is really beautiful during the summer. I would not want to get stranded there in bad weather. It is in the middle of no where. Your best bet is Ft. Chiswell Campground just over the Virginia border. There are two Flying J's close together near the campground. The campground is not a place I would want to spend more than a night but they are year round, full service and clean restrooms. Oh, they have a great dog walk area. Nice people just a little light on the ambience side of things.
The only bad roads you will encounter is the West Vigrinia Turnpike. Parts are really rough but not unbearable. Nice rest areas all the way. Watch the weather closely as the mountains can get very heavy fog and lots of snow and ice. Know this first hand on our last trip. Pay attention to the cut off around Ft. chiswell that takes you on I-77 and the same in Columbia. Good luck and enjoy. The scenery is far superior to going down I-75