Abstract: A vehicle discharge system for a vehicle (1) provided with a rearwardly tippable bed (2) which includes a tailgate (3) is constituted by a housing (5) mounted at the rear of the bed (2) adjacent to the tailgate (3), a discharge auger (4) rotatably supported within the housing (5) and arranged to receive material which passes the tailgate (3) when the bed is tipped, an auger drive (9) to drive the auger and discharge material carried within the vehicle bed (2) to the side of the vehicle (1) as the bed is tipped and flow control structure (1) capable of differentially exposing material held within the vehicle bed (2) to the discharge auger (4). The flow control structure is constituted by a flow control gate (1) which is capable of being moved in a plane substantially perpendicular to the plane of the base of the vehicle bed (2) and tilted to form a tapered and adjustable opening which exposes material within the vehicle bed to the auger as the bed is tipped.