Your first mistake was asking your local sheriff. Your second was asking the NCSHP and your third was asking the Weaverville PD.
In NC, there is no distinction between a loaded and unloaded gun. If you don't have a CHP, then do not conceal your gun within the cabin of the vehicle unless it is out of reach, locked up, and/or not easily accessible.
You can OC within your car. There are no laws against it. Many people just keep the gun holstered on their hip when they enter their vehicle. There is some disagreement regarding this among some and that has to do with the seat belt coming across the gun and blocking view of it. Some feel that this constitutes concealment while others do not.
Others will just put the gun on the passenger seat - uncovered, in the open. Or on the dashboard, uncovered and in the open. There are some problems with those options as well. If you have to come to a sudden stop or are involved in an accident, then the gun will go flying. To get around this, some have holsters set up on their passenger seat seatbelt or somewhere else that keeps the gun out in the open but secured.
Think about this.. If you go into a restaurant, get your food, and then sit in a booth that is against a wall so that the gun on your hip is facing the wall - are you carrying concealed? The answer is No. It's kind of like a cop approaching you from your left hand side with your gun holstered on your right. He cannot see it but that does not mean you are concealing.