A cargo handling system (CHS) is provided and includes a guide tray along which an electric rail extends and a carrier movably disposable within the guide tray. The carrier includes a carrier surface, guide and contact rollers for establishing electric communication with the electric rail with the carrier movably disposed within the guide tray, drivable elements to assume retracted or extended positions at which, with the carrier movably disposed within the guide tray, the carrier surface is deployed within or above the guide tray, respectively; and a control system. The control system is configured to draw current from the electric communication between the electric rail and the contact roller and to use the current to operate the drivable elements to move the carrier along the guide tray and to control extension and retraction of the drivable elements.