Skeleton Semi-trailer is a most common type of trailers for container transportation (or Container Chassis) which have light weight but heavy capacity, without floor can easy the tank container's discharge. If choose the Gooseneck type, can lower the clearance to get a better delivery quality for the dangerious tank contianer and Vibration sensitive cargos.

Container locking Pins (twistlock) and corner casting together form a standardized rotating connector for securing shipping containers. The primary uses are for locking a container into place on a container ship, semi-trailer truck or railway container train, and for lifting of the containers by container cranes and sidelifters. 

A semi-trailer axle is a  central non-powered shaft that connects the wheels of a semi-trailer for rotating.  And the axle is connected to the bottom of a body of semi-trailer by the suspension system. And there is a pair of devices braking a wheel through an air valve.

Mechanic Suspension System also calls a leaf spring is a simple form of spring commonly used for the suspension in wheeled vehicles. It is usually mounted in series under the main beam.

Air suspension System Air suspension is a type of vehicle suspension powered by an electric or engine-driven air pump or compressor. This compressor pumps the air into a flexible bellows, usually made from textile-reinforced rubber.