An elongate beam assembly for supporting cargo is provided. The beam assembly includes an elongate beam extending between first and second ends, the beam comprising a bottom wall with a downward facing surface and extending across a bottom width. A top wall includes an upwardly facing surface and extends across a top width between right and left edges and opposite right and left side walls extend between the bottom and top walls. The bottom width is smaller than the top width. Each of the right and left edges of the top wall define respective right and left side surfaces. Right and left ribs extend from a bottom edge of each respective right and left side surface to the respective right and left side wall.