keywords: truck, trailer, trailing, auto, automotive, automobile, tech, technician, mech, mechanic, delivery, van, welder, welding, driver, CDL, heavy-duty, heavy duty, duty, journey, journeyman, entry, skill, skills, skilled, Napa, Service, Sales, mobile, growth, career, diesel, engine, motor, brakes, diagnostic, diagnosing, DOT, electronic, scanner, electronics, gas, gasoline, propane, hydraulic, PM, preventive maintenance, oil, semi, semi-trailer, tractor, pickup, benefits, medical, dental, vacation, vision, retirement, tool, tools, shop Accurately diagnose, repair, and maintain all parts and components on heavy duty trailing equipment in a timely manner and quality fashion, including but not limited to the following: Perform quality preventive maintenance services and DOTinspections on semi-trailers and dollys .