Abstract: A side sectional panel assembly for use on a trailer having side beams along the sides of the trailer bed. Each side panel section is hinged to the trailer by a hinge assembly pivotally connected to the side panel and removably connected to the side beam of the trailer to limit the swinging movement of the panel section away from the trailer bed to an upright position and permits swinging movement of the panel section onto the trailer bed. End panel connectors are provided on the adjacent panel section to bridge the gap therebetween.

Abstract: An improved trailer convertible to one position for hauling floor supported cargo and to one other position for hauling granular material. The trailer has a floor assembly including; a pair of center floor panels which are supported on the trailer frame and form a portion of the floor supporting structure in one position and which are removable and positionable for cooperating to retain granular material in one other position; and a pair of end slope members which are removably connectable to the trailer for cooperating with the center floor panels and portions of the trailer sides to retain granular material. The trailer is adapted such that pre-constructed sections of the trailer can be shipped and assembled at a remote location.