I hear the blue ridge parkwayin North Carolina is nice.
Happy Camper,
We'll wander a little off the YNP topic for a moment to address your question.
Typically an RV Forum rally needs a park that can host up to 20-25 rigs at a time of various sizes from the largest to the smallest. Many places are just not set up for that. Often we negotiate a "rally rate" with the owners to benefit both the attendees and the owner filling up his sites.
On the other hand, a rally happens when someone decides to pick a date and a place and fires it up!
We will actually be coming down the East coast in November, stopping at Gaffney, SC for Freightliner, but if you want to fire up an interest post in the Rally section and see what you see, give it a shot! I'd be glad to help you!
There are many very good spots in the area as soon as you determine the boundaries of the "southeast"...

(I say that because I am an Arkansas Razorback in the Southeast Conference and we play Texas A&M and nobody who can read a map would consider College Station, TX the "southeast")
Kim