Abstract: A dump bed assembly (18) is provided for coupling to a truck having a chassis (22) for supporting the dump bed assembly (18). The dump bed assembly (18) includes a cargo receiving dump bed (13) coupled to the chassis (22) and movable between a travel configuration and a dump configuration. The dump bed includes a metal skeletal frame (85) including a plurality of frame members that define a plurality of openings (171) between the frame members. A plastic bed (90) comprises at least one plastic bed member coupled to and supported by the plurality of frame members. The plastic bed member extends into the openings defined by the frame members.