Abstract: The apparatus and system for supporting and attaching loads on a vehicle, is adapted for installation on side walls of pick up truck beds, providing discrete attachment points for ratcheting straps and the like for securing the loads. The attachment points include attachment slots incorporated along rails on or incorporated with the tops of the walls. The rails can be integrated into a cap structure mounted on or integrated with the upper surface of the wall, or formed in the wall when manufactured, and the rails can extend along all or a part of the length of the wall. If mounted on the top of a wall, the rail can be permanently or removably integrated with the cap structure, and mounted in a variety of manners, including with fasteners or clamps, such as in existing stake holes.

Abstract: A modular apparatus and system for supporting and attaching of loads to a vehicle, permanently or temporarily installable on vehicles, particularly on side walls of pick up truck beds, and also work trucks, and vans, in a variety of configurations for adapting to different loads, and providing a multitude of discrete attachment points for ratcheting straps and the like for securing the loads. Also utilizes elongate channels configured for receiving various embodiments of rails, each rail including an elongate array or pattern of attachment slots configured and operable for attachment of fittings or locking or latching mechanisms for securing items for supporting and securing loads. Also can incorporate an upstanding rack structure utilizing upstanding support elements mounted on or in connection with the sidewalls with or in place of the rails, and optional cross members configurable variously for supporting loads in a variety of arrangements.