An elongated anchor rail is installed on the edge of a tailgate for retaining a tailgate accessory to the tailgate. The anchor rail has a flange portion with a flat surface partly covering an inside surface of the tailgate. The flange portion has longitudinal inside and outside edges. The anchor rail also has a channel portion projecting at right angle from the flange portion. The channel portion is at a distance from the outside edge, and forms with the flange portion a recessed seat adjacent to and along the outside edge. The channel portion further has a T-slot in the recessed seat facing toward the outside edge. When a tailgate accessory is mounted to the T-slot of the anchor rail, it is partly or completely included in the recessed seat. The tailgate accessories comprised in the tailgate attachment set include a pair of ramp ends and a number of lugs and hooks.