I am the other owner Tom was referring to. I put an O-Scope on the pilot signal and discovered that the Shorepower Stations (in Spokane at least) only swing the pilot signal from 0 to +12V. The -12V swing is not there!!! Since the -12V swing is really the integral part of the safety system, I'm not quite sure how they pass UL without it.
I'm pretty sure UL doesn't care if it meets charging interface standards. They only care about electrical safety.