Corrected entry: At his interview, Tom is told that the drivers have to maintain their own trucks at night. So why does the company employ Ed the mechanic?
Correction: Maintenance and repairing are two different things. Maintaining a truck is fuelling, checking fluids, adding if necessary, keeping relatively clean, checking and setting brakes, etc. Maintenance does not include overhauling an engine or transmission, or diagnosing and repairing mechanical problems. That's Ed the mechanic's job.