A vehicle article carrier system employing a pair of support rails adapted to be secured to the sidewalls of a bed of a pick-up truck. Attached to the sidewalls are a pair of tie-down assemblies that can be fixedly secured at various points along each of the support rails. A load bar assembly is also included that can be quickly and easily attached to and detached from the tie-down assemblies. When the load bar is not in use, the tie-down assemblies can be used in connection with external bungee cords, nylon straps or other fastening implements to help restrain articles within the bed of the vehicle.