A box trailer is a transport vehicle that is modified or manufactured separately on the chassis of a box truck, and is mainly used to transport goods. The compartment is usually closed to form a closed compartment to protect the goods from the outside environment.

Skeleton semi-trailer‌ is a special type of semi-trailer, mainly used to transport special cargo such as containers and dangerous goods tanks. Its structural features include the frame and front and rear axles connected by hinges, which can be quickly separated and connected. The main structure of the skeleton semi-trailer is the frame, which is usually made of high-strength ultra-heavy steel, with a high load-bearing capacity and the ability to adapt to various road conditions.‌