Abstract: The truck box carrier includes a wheeled, load supporting frame which can be adjusted and locked into various positions so that the frame may be used to move and support various configured truck boxes of various sizes. The frame is adjustable in the vertical direction by use of telescopically interactive support legs; in length by supplying telescopically interactive longitudinal side members; and in width by load or box brackets that are transversely adjustable across the width of the frame. The frame members and a load supported by the frame may be locked or secured in place by an indexed aperture and pin locking system.