A drive-over conveyor for receiving material from a bottom-discharge material transport vehicle features a belt conveyor spanning a loading section, a transition section feeding into a secondary conveyor, and a cleanout section for clearing debris that may collect the space between upper and lower runs of the belt. At the cleanout section, the belt is entrained about one or more augers that convey such debris laterally outward from between the belt runs. The loading section features a low-profile framework of resiliently flexible beams that is normally carried in slightly spaced relation above the ground by ground wheels of the section, and that temporarily flexes downward when the vehicle is driven over. Accordingly, the loading section can be wheeled between different positions without any lifting, enabling quick and convenient repositioning of the loading section between different outlets of a parked stationary vehicle, and the need for dedicated drive-over ramps is avoided.