Abstract: The present invention relates to a center-line trenching system for use at the earth's surface such as on a paved street, road, highway or the like. The system includes a rubber tired drive machine movable over the earth's surface for advancing a side-by-side tandem of a earth saw and a conveyor attached to a rear surface of the drive machine. The conveyor includes a subframe and an elongated main frame. The subframe comprises a pair of longitudinally extending truss members pivotly attached to the drive machine at a first pivot axis of rotation that is fixed in elevation relative to the earth's surface. The main frame includes a pair of rail members pivotally mounted at near end regions to the truss members at a second axis of rotation, and has trailing end regions that define the remote termini of the conveyor. A hydrostatic actuator is pivotally mounted between the subframe and the main frame.