Systems, methods, and apparatuses for controlling objects being loaded or unloaded from a storage structure or vehicle, such as a trailer. In example embodiments, a plurality of parcels may be stored in or on a trailer that is attached to a cab of a delivery vehicle. Upon arrival at a deposit location, the trailer loaded with the one or more parcels may be removably secured to a an adjustable platform designed to be raised to a predetermined angle for unloading of the one or more parcels. Once the adjustable platform is raised to the predetermined angle, a plurality of adjustable dividing mechanisms may be configured to pivot, allowing for the movement of a controlled volume of the one or more parcels onto the receiving platform.