heavy and tractor-trailer truck drivers

Operating self-propelled equipment such as truck and trailer that assists with reaping, harvesting, threshing, swathing, or winnowing crops; performing manual or mechanical adjustments to equipment; performing safety checks on equipment; maintaining and repairing equipment and other tools; driving truck with trailer for transporting crops to elevators, silos, yard, or other storage areas, and transporting equipment and other tools used for harves ting from one field to another.