I just looked at the national Hurricane Center's latest projected track and saw potentially good news.

If you look at the southern part of North Carolina, Topsail Beach is about halfway between the border with SC and where the hurricane is supposed to brush land. I may do alright yet.
As for the boat, I've got a boat repair shop on the mainland who has offered to let me keep my boat there. Alternately, i may put it in the garage since we don't look like we're going to flood.
Burying the boat to the gunnels isn't a good option for me. The boat is an inboard/outboard. If I bury it, the engine is going to be toast. The boat guy assures me with that heavy ass engine in there, my boat isn't coming off the trailer. I'll rachet it down with some heavy duty strapping if it comes to leaving it outdoors at the boat shop.