I boondock in the George Washington Natl Park near a very popular called FLAGPOLE RIDGE. This is about 150 miles away from where I live in King George, Virginia I don't know if I would call it dispersed camping or not... Just me and the bears and the Forest Service Road is about 1/2-mile away from me..
This looks out over the Mountain Range in the WVA direction and i can see at lease 4 to 5 rolls of mtns ridges...
I never asked permission and have not been told I could not setup here with my Tents or my OFF-ROAD POPUP Trailer. Did have a Ranger visit one time - I guess he heard some squeaks and squawks from my Ham radio and had to come look see... We had coffee for about 30 minutes and talked about the scenery there. Also got a discussion about food management as there was known bears in this part of the Natl Forest.
I was on FS85 road and found a tire trail leading off too the edge of the FLAGPOLE RIDGE. I am just far enough away to not hear all of the Boys Scouts, Jeep Clubs, and ATV Clubs all camping around the FLAGPOLE setup in a somewhat camping area with no resources...
Used to go off-road all the time with my Jeep pulling a Utility Trailer with my Tent Camping items and supplies in North Central high country of AZ when we lived in the Phoenix area back in the 70s... Never ran into many other off-road so it was pleasantly quite... Wild pigs (Javelina) were the scary wild animals to me roaming free out there - they ran in packs...
Have been down the Blue Ridge Parkway from VA to TN several times. A great JEEP RUN... Lots of BIKERS on the Parkway that you have to watch out for because of their low profile. Have seem alot Bicycle groups on the Parkway as well. Also when bears are sited the side of the road fills up real quick with cars and people looking... Also when driving the early evenings you really have to watch for wildlife crossing the road especially deer...
There is a CAMPSITE about every 50 miles along the parkway and maybe only three Way-Stations with Gasoline/Restaurants.. Just be sure if you pulling a trailer to not just get off the parkway at any exit you see. Unless they are a major road crossing the road will be winding and steep curves etc. Not fun when pulling a trailer. You probably won't find any services unless it is a major road crossing exit anyway.
The whole trip from VA to TN is around 450 miles so plan on having enough gas on board and won't be a problem. We actually got off the Parkway at Roanoke VA usually to get a few things maybe eat in a restaurant etc and they got back on the parkway to finish the trip...
In the high country there looks to alot of good possible off-road camping places but we never ventured over to them. Have the regular parkway camp grounds every 50 miles is where we stayed. Never expensive for sure... None of these camp grounds had electric available. All had rest rooms and usually a small camp store with things. The ones associated with the Way Station all had a restaurant and gasoline as well as a big camp store....
Speed limit on the parkway max is 45MPH with lots of curves and a few tunnels and even Viaducts (elevated roadway) section...
Roy Ken