The present invention relates to a truck chassis for carrying an automobile body and various specially-equipped devices as loads, and more specifically to a truck chassis for carrying an automobile body and various specially-equipped devices as loads, which is configured to enable various types of cargo boxes (load sides) intended to carry cargos or people and various types of special equipment designed to be suitable for the transportation of a special cargo or a special purpose to be conveniently and replaceably loaded, and thus enables a single chassis to be used for various purposes, thereby improving cost reduction, convenience functionality, and maintenance, and which, in particular, provides excellent coupling force and also allows a coupling location to be varied according to the type or center of gravity of a load, thereby enabling stable loading.