N.C. Gen. Stat. § 20-147.1: Passenger vehicle towing other vehicles to keep right.

Whenever a noncommercial passenger vehicle as defined in G.S. 20-4.01(27)l. is towing another vehicle as defined in G.S. 20-4.01(49), the driver of the towing vehicle shall at all times cause that vehicle to travel on the right half of the highway, and upon any highway having four or more lanes for moving traffic and providing for two-way movement of traffic, the vehicle shall not be driven in the left-most lane of the right half of the highway except when overtaking and passing another vehicle proceeding in the same direction, when preparing for a left turn, or the right lanes are obstructed or impassable. These towing vehicles shall also comply with all signage for vehicles of three or more axles erected pursuant to G.S. 20-146(d)(3). (2004-124, s. 30.6(a); 2004-199, s. 56; 2017-102, s. 5.2(b).)