This is true for hot dog carts all around Raleigh? What about the food trucks that are cooking burgers and pizza on the street?
All mobile food service in NC has to have a kitchen and food storage, subject to the same health inspections as any restaurant. The ones that you think don't may stop off somewhere on the way home to do it, or they are skirting the law and haven't been caught yet. I have a very good friend in the dog cart business in raleigh, he works hard to see that his competition follows the same health codes as anybody else. but, you can't catch them all.