As the core equipment of road logistics, the semi-trailer realizes flexible combination with tractor through articulated connection, and the maximum load capacity covers 20-100 tons. The frame is made of high-strength steel with laser welding process and air suspension system, which takes into account the load-carrying capacity and vibration-damping performance. The modularized design supports the quick replacement of top loads, which can be adapted from container transportation to bulk cargo loading. The core advantage lies in the compatibility of “one vehicle for multiple applications”, for example, by replacing the gooseneck structure, the same chassis can be switched to low-flatbed or warehouse trailer, which can be widely used in port intermodal transportation, bulk commodity transportation and handling of special equipment, and significantly reduces fleet operating costs.