heavy and tractor-trailer truck drivers

Operating self-propelled equipment such as tractor trailer that reaps, harvests, threshes, swathes, or winnows crops such as corn, wheat; performing manual or mechanical adjustments to equipment; performing safety checks on equipment; maintaining and repairing equipment and other tools; driving truck, tractor, and trailer for transporting crops to elevators, silos, or other storage areas, and transporting equipment and other tools used for harves ting from one field to another.