Abstract: A low profile toolbox or other compartment for installation in the tailgate of a pickup truck or in any other vehicle door. The toolbox has a body portion that is installed inside the tailgate through an opening in the inner or outer panel. A flat lid is pivotally attached by means of a frame over the opening. Because the lid is flat and the body is inside the cavity, the top surface of the toolbox is substantially flush with the inner panel of the tailgate. In this way, when the tailgate is open, the toolbox creates no obstacle to use of the tailgate to slide objects in and out of the truck bed. Yet, the toolbox is more easily accessible than if it were attached to one of the sidewalls of the truck, at the front of the bed, or even inside the truck.