Container chassis, also called intermodal chassis, is a type of semi-trailer designed to securely carry an intermodal container. Chassis are used by truckers to deliver containers between ports, railyards, container depots, and shipper facilities. Chassis have a kingpin so they can be connected to a semi-tractor. They also have a pair of legs called landing gear that can be cranked down to park them when not hooked up to a tractor.