Keep in mind that the camp sites on the Parkway have no hookups... The sites do have a central bath rooms where you can also get water from a spigot... These were tent sites in the beginning.
Be sure to check out the roadways on the parkway web site... Some tunnels... Generally each of the camp ground are situated around 50 miles a part... Usually there will be a way station near the camp ground on the parkway. They usually have gasoline and a adjoining restaurant along with a gift shop and supplies etc...
If you really want hookups you can go off the parkway and usually find a good place at the major exits... Some of the exits off the parkway can be hard to maneuver with a big Rv setup... I would plan on using only the major road crossing exits...
Sherando Lake mentioned above is not on the Parkway but close by... Excellant camp ground with both hookups and dry camping spots...
For the most part I81 follows the parkway. We have driven the parkway a few time from Virginia to Tenn tent camping at first and then one time with our POPUP trailer camper...
Be sure to download the road map for the parkway - has alot of info on it...
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
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