Abstract: Improved trailers (e.g., semi-trailers) are disclosed. The trailers may include a floor having a top surface and a bottom surface, where the top surface is adapted to transport a payload, and an elongated shell connected to the bottom surface of the floor, where the elongated shell defines a portion of a substantially closed torsion-resistant chamber of the trailer. The trailers may have a torsion resistance that is substantially higher than conventional trailers of similar size and/or load capacity. The trailers may weigh substantially less than conventional trailers of similar size and/or load capacity. The trailers may realize a bending resistance that is at least equivalent to the bending resistance of conventional trailers of similar size and/or load capacity.

Abstract: The invention generally concerns a semi-trailer to be trailed by a tractor. The semi-trailer comprises a wheeled deck having two lateral sides, proximate and distal longitudinal end sides. The semi-trailer also comprises two wall structures so pivotably mounted to the deck along a respective lateral side thereof as to be movable between an upright position, where the semi-trailer is in a dry-box configuration, and a lay down position wherein the semi-trailer is in a flatbed configuration. The two pivotable wall structures allow the semi-trailer to be moved between the dry-box configuration and the flatbed configuration.

Abstract: The invention generally concerns a semi-trailer to be trailed by a tractor. The semi-trailer comprises a wheeled deck having two lateral sides, proximate and distal longitudinal end sides. The semi-trailer also comprises two wall structures so pivotably mounted to the deck along a respective lateral side thereof as to be movable between an upright position, where the semi-trailer is in a dry-box configuration, and a lay down position wherein the semi-trailer is in a flatbed configuration. The two pivotable wall structures allow the semi-trailer to be moved between the dry-box configuration and the flatbed configuration.

Abstract: Improved trailers (e.g., semi-trailers) are disclosed. The trailers may include a floor having a top surface and a bottom surface, where the top surface is adapted to transport a payload, and an elongated shell connected to the bottom surface of the floor, where the elongated shell defines a portion of a substantially closed torsion-resistant chamber of the trailer. The trailers may have a torsion resistance that is substantially higher than conventional trailers of similar size and/or load capacity. The trailers may weigh substantially less than conventional trailers of similar size and/or load capacity. The trailers may realize a bending resistance that is at least equivalent to the bending resistance of conventional trailers of similar size and/or load capacity.