An elongate beam that supports an object in a storage space. The elongate beam has: i) a bottom wall with a downwardly facing surface; ii) a top wall having an upwardly facing surface and laterally spaced first and second side edges; and iii) laterally spaced first and second side walls with oppositely facing substantially flat surfaces. The top wall has lengthwise ends defined by edges and projects in cantilever fashion laterally beyond the flat surface on the first side wall to define a first flange with a first width between the flat surface of the first side wall and the first edge. The end edges do not extend orthogonally to a lengthwise center line for the top wall between the first and second side edges fully between the first and second side edges.