As a medium/heavy duty truck technician, responsibilities could include inspecting, maintaining, repairing and overhauling major components in trucks, buses and other commercial vehicles. The work can vary from HVAC, electrical, suspension, truck diagnostics, engine diagnostics, brakes and routine maintenance. Continuing advances in truck and engine technologies have made it essential to have up-to-date training and skills. Advanced training and certifications in this field provide the best opportunity for earning potential.