Designed to loan internally, barges specifically designed for the vessel. The concept is to quickly float the barges to the vessel (using tugs or ships wenches) load these barges through the rear of the vessel, then sales. Upon arrival at the foreign post, the reverse happens. Barges are quickly floated away from the vessel and another set of waiting barges quickly are loaded. Designed for quick vessel turn-around. Usually crane-equipped; handles mostly break-bulk cargo.