ROOF FOR A WORK VEHICLE

A roof (102) for work vehicle comprises a molded roof portion (200) formed by rotational molding, the molded roof portion (200) having a first surface (202) that is generally planar and faces upward, and a second surface (300) molded integral with the first surface (202), wherein the second surface (300) faces downward and has a plurality of integrally molded troughs (308, 310) that extend upward into the second surface (300).