The present invention relates to an adjustable, locking cargo control system for a vehicle such as a flat bed trailer, van type trailer, train, airplane or the like. The tie down system comprises at least one groove within the floor of the truck trailer. Each groove has a flange extending inward on either side of the groove. One of the flanges has a plurality of notches formed in it. The system includes at least one tie down member comprising an anchor hook insertable into the groove wherein the hook registers against an anchor flange opposite the flange having the plurality of notches. Each tie down member further comprises at least one boss extending therefrom which is positioned and sized to engage at least one of the notches in the notched flange in a manner preventing the tie down member from sliding along the groove. A tie down chain or cable is attached to the tie down member in a manner to secure a load to the floor of the or other portion of the vehicle.