The MAFI trailer, a self-propelled modular trailer with a built-in gooseneck, is a critical piece of heavy equipment used in ro-ro operations. It is designed specifically for safely transporting heavy, indivisible cargo (such as large construction machinery and transformers) on ship decks. Its low-profile structure facilitates roll-on/roll-off loading, and its powerful hydraulic system enables precise lifting and steering. It can transport cargo directly from the dock to a designated location onboard and then lower it, significantly improving the efficiency and safety of loading and unloading heavy cargo.