vehicle xportation of a firearm is a gray area in NC since there are no specific statutes covering it. the NC AG's opinion of course just states ~ officer safety is paramount. section III D for your reading pleasure: http://www.ncdoj.gov/getdoc/32344299...-gun-Laws.aspx
as stated previously, whenever i travel across state lines, i have a document box (firesafe type from wally world, that sits on the seat next to me where i carry my firearm for ready access) and if i get stopped by some nice LE who liked my out of state plates and just wants to be friendly i just close the lid and the firearm is locked and free from prying and inquisitive eyes. the key is maintained in the trunk by the spare tire.
enjoy your drive thru the state to your peach(y) destination...