Container semi trailer is mainly for containers transportation, it can be customized: 
1-trailers can be for 20FT, 30FT, 40FT, 45FT, 48FT, 50FT, 53FT container shipping
2-flatbed or skeleton chassis type
3-Main beam: 500mm height
4-material of the main beam: Q345
5-Suspension: Spring suspension, Rigid, single point, bogie or air suspension
6-Axles number: 2 3 4 axles. 
8-Jost landing gear, FUWA axles and Tri-angle tires
9-extendable or sliding type optional