The curved semi-trailer, Strong model, is equipped with tailgates, raise and lower system, cover and uncover and sliding walls, with Multi Punto rib in ADR, suitable i.e. for the transport of dangerous goods and equipped with Imo hooks for intermodal transport. The vehicle is equipped with a very flexible system that is easy to open on all three sides for loading and unloading goods by mechanical means, thanks to the use of a cage made of removable pieces, consisting of a metal frame with removable horizontal bars made of metal or wood, covered with thick and strong sheets made of plastic material.