A modular mounting device and system for interconnecting accessories to a structure to provide modularity and adjustability for a variety of applications. In some embodiments a column is configured to interconnect with a column receiver. In some embodiments an accessory ring is configured to interconnect with a column. In some embodiments, an accessory is configured to interconnect with an accessory ring. In some embodiments, the interconnection of one or more elements results in the digital and/or electrical interconnection between the interconnected elements.

A concave square tube lifting storage shelf is provided. The concave square tube lifting storage shelf includes a plurality of post components, two fixed storage layers and a plurality of moveable storage layers. These post components each include a concave square tube, with each concave square tube comprising a concave plate. Each fixed storage layer includes a fixed shelf and a first assembly component, with the first assembly component being mounted on the fixed shelf. The first assembly component is fitted onto the outer side of the concave square tube, and the fixed storage layer is assembled between the post assemblies via the first assembly component. The movable storage layers each include a movable shelf and a second assembly component, with the second assembly component mounted on the movable shelf. The movable storage layers can move in the lifting direction.

A shelving system with a shelf, two rear vertical posts and two front vertical posts. The posts all have vertically spaced apart openings passing therethrough. The shelf has a pair of front side support arms that pass through the apertures in the front vertical posts and a pair of rear side support arms that pass through the apertures in the rear vertical posts. The rear of the shelf can be raised or lowered and re-attached in a new position while the front side support arms remain positioned within the apertures in the front vertical posts. If the rear of the shelf is accidentally dropped, the shelf rotates such that the front side support arms lock against the top and bottom of the vertically spaced apart apertures, thereby preventing the shelf from falling.

A shelving system with a shelf, two rear vertical posts and two front vertical posts. The posts all have vertically spaced apart openings passing therethrough. The shelf has a pair of front side support arms that pass through the apertures in the front vertical posts and a pair of rear side support arms that pass through the apertures in the rear vertical posts. The rear of the shelf can be raised or lowered and re-attached in a new position while the front side support arms remain positioned within the apertures in the front vertical posts. If the rear of the shelf is accidentally dropped, the shelf rotates such that the front side support arms lock against the top and bottom of the vertically spaced apart apertures, thereby preventing the shelf from falling.

A vehicle includes a chassis, a cargo body coupled to the chassis, a cargo support member, and a shelf assembly. The cargo support member is mounted to an outer wall of the cargo body and is disposed within the cargo body. The shelf assembly includes a tray and a strap. The tray is hingedly coupled to the cargo support member. The strap is coupled to the tray and the cargo support member. The strap is adjustable to reposition a forward end of the tray.