Disclosed herein is a movable platform (MP) for moving freight during cross-dock operations. The MP comprises a mechanical lift brake assembly that can be utilized to deploy a plurality of mechanical lift brakes preventing further movement of the MP. A MP forklift attachment that can be used to convey the MP and to engage or disengage the mechanical lift brake assembly. The MP forklift attachment can be attached to a conveyance vehicle, such as a forklift, or built into an automated guided vehicle.