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 DOT inspections on semi-trailers and dollys.