The present invention discloses a large size truck with a truck frame. The truck frame has a separating arranged main beam, the main beam has a front truck frame device, fulcrum bearing two front wheels at least through a hanging device, the truck frame is provided a plurality of wheel bosses to fulcrum bearing rear wheels, each wheel boss bears a pair of rear wheels which are separately located at the two sides of the wheel boss, and the rear wheels is used for pivotally arranging a basically stiff vehicle body bearing device; and a device used for keeping the lateral distance between the rear wheel pair; the main beam of the truck frame can resist the torsion of rear wheels caused by a brake force and a towing force, but allows rear wheels to finite rotate encircling a vertical axis of the each main beam of the truck frame to slope when the truck passing through a unsmoothed road. |