Abstract: A device for securing a bogie at predetermined positions on a trailer hitched to a tractor, having a pair of spaced housings secured to a cross beam of the bogie and supporting a pair of pins adapted to secure the bogie to tracks on the trailer, the pins being tandemly controlled by a handle which is also coupled by an adjusting member to a control valve connected between a source of pressured air on the tractor and the brake system on the bogie. When the pins are in an engagement with the trailer, the control valve is actuated to release the bogie brake system. When the pins are not in engagement, the control valve is actuated to vent to atmosphere the pressurized air thereby leaving the brake system operative. A lock pin is used to secure the handle in the engaged position.

Abstract: A vent door and frame assembly for cargo bodies includes a pair of rectangularly shaped frame members one of which defines a door frame opening and supports in hinged relation a vent door. The frame members during assembly with a wall construction are positionable in telescoping relation wherein they overlap opposite sides of a cargo body and when in this position form a permanent frame structure connected to the sides of the body. By virtue of the telescoping relationship of the frame parts the frame assembly is adapted to be readily utilized with cargo bodies having walls of different thickness.