[Shivetya]

Until the automate the process of inspection and refueling it would be a good job to place people. Treat it like an airplane coming in from a flight. Support crew go out to verify the condition the truck thinks its in, fix minor things the truck called out, and refuel it. Sign off on the paperwork stating truck meets all acceptable Federal and State laws.

[Bartweiss]

This is definitely part of it - humans are great at flexible-requirement tasks. Gas the truck, kick the tires, squeegee off the sensors, make sure nothing is obviously falling apart. Rather than paying one human per truck, you pay one human per ~200 trucks to do all of the minor, unpredictable service tasks needed.