Abstract: A portable self-contained fifth wheel device for detachable mounting on a vehicle for pulling a wheeled container comprising a frame for detachable connection on a wheeled vehicle of the type having two support arms with the frame including a pivotally mounted support member for detachable connection to a wheeled container. The frame has two interlocking members including a hollow housing in the form of a guide track for slideably receiving the support arms, and the housing includes a manual actuated locking means for selective locking engagement with the support arms for supportably mounting the container on the fifth wheel device. The device further includes an air tank with connecting air hoses to be used in connection with the wheeled container for releasing the air brakes thereon.