Patent ID: 8172308

Claim:
A trailer comprising: a pair of spaced apart sidewalls; a front wall; a rear wall; a roof assembly extending between and mounted atop said sidewalls such that said sidewalls and said roof assembly conjointly define a cargo space, said roof assembly including: a roof sheet extending between said front wall and said rear wall, said roof sheet having an interior surface facing said cargo space and an opposing exterior surface; and a plurality of elongate support beams attached to said exterior surface of said roof sheet and extending between said sidewalls, each said beam including: at least two substantially flat contact portions attached to said exterior surface of said roof sheet; and a rib portion interconnecting first and second ones of said contact portions and defining a channel between the rib portion and said exterior surface of said roof sheet, said rib portion including a first wall adjacent to said first contact portion and a second wall adjacent to said second contact portion, said first wall being oriented at an angle of approximately 90 degrees relative to said roof sheet.