Abstract: The invention generally relates to a mobile leak-proof container structured to contain a load after any rollover. The invention provides a safer way to transport loads and minimizes the risk of an environmental spill or leak when hauling waste generated by the oil and gas industry. The container, such as a dump truck bed or a dump body, includes a central leak-proof top-loading door; a rear tailgate for dumping the contents from the rear of the container; recessed framework having upper margins of the container walls and a door-jamb that define a reservoir; and a plurality of brace members for supporting the frame against the walls of the container. It also includes one or more corner panels covering the brace members and for preventing the loading of any load near the juncture of the roof framework and each respective adjoining side wall.