Skeleton Semi Trailer has no bottom plate and can only be used for transporting containers. Shipping container delivery trailer is one kind which is specifically worked in terminal port for load and lifting containers precisely and quickly by welded the guide block, bottom block and indicated bar. Current standard containers are available in standard sizes of 20 ft, 40 ft, 45 ft, and 48 ft (The world's uniform ISO standard). Most of the Container Terminal Semi Trailers currently in use are standardized general-purpose products, such as 20, 40, 45, 48-foot fixed-length skeleton semi-trailers. The frame of the fixed-length container semi-trailer is a space frame welded structure, which is formed by welding two I-shaped longitudinal beams and a plurality of beams (C-shaped channel steel).