Abstract: A cargo carrier assembly for use with a pickup truck or other cargo-carrying vehicle includes a movable tray for the bed of the pickup truck. The carriage includes wheels to roll along the bed between a storage/transit position within the bed when the tailgate is up or down, and an access/loading position on top of the tailgate when the tailgate is down. Also, there are retainer assemblies for retaining the tray in the stored position, as well as in the access position.