Abstract: A live bottom trailer or vehicle having horizontally outwardly pivoting doors as the tailgate. The live bottom trailer includes a hopper having an opening top with sidewalls converging towards and endless conveyor. The endless conveyor is operable to mobilize material in the hopper rearwardly toward the rear discharge area of the trailer. A pair of doors are hinged to the hopper sidewalls and pivot outwardly away from each other. The doors can be positioned in a rearward projecting manner such that they direct material more deeply into an asphalt paver. The doors are independently controlled by pneumatic or hydraulic cylinders to allow the material to be directed left or right. The mechanical linkage which connects the cylinders to the doors has an over center position such that the doors stay locked even if pressure in the cylinders is lost when material in the hopper is exerting rearward force on the doors of the hopper.