Sort of reminds me of a Harbor Pilot[0]. A person who holds unique knowledge of how to operate a large vehicle in a particular piece of confined geography.
I doubt a "hub driver" will earn a 6-figure salary, but manoeuvring a semi truck two or three trailers is definitely a skilled job that many (most?) people are not capable of learning to do well.
0: http://www.insidejobs.com/careers/harbor-pilot