I called this a medium Freighter, but this one is fairly large. It is the long "neck" and Star Trek variant of the design. The underside of the neck is where cargo modules of varying sizes attach to the ship. Includes the capacity to carry a starship, such as in a rescue or salvage operation or to deliver a starship hulk to whatever destination. Pictured below are 3 variants. The far right shows the ship loaded with a large cargo module.