A storage tank defines a square hopper bottom converging to a bottom discharge located at one corner. The tank sits on a base frame defined by four vertical retractable legs with one leg at the discharge recessed inwardly from the corner. A discharge conveyor is mounted at the discharge for rotation about an upstanding axis at the discharge opening unimpeded by the recessed leg to move the conveyor from a retracted position along a side of the frame to an extended position at a selected angle outwardly from the frame. A horizontal platform and ladder is located at one side of the tank with the ladder being movable to a stored position parallel to the platform and both the ladder and the platform are movable to a stored position along the side of the tank.