I never saw one to be honest they were trying to track one down, probably had 500 mile range and charged in 20 minutes
, we made automation for the logistics business in my time, we had some real funky machines, the owner at that time used to come up with a idea, sketch it out literally on a fag packet and then get it made, never forget working on a machine that transported used nuclear waste in these large flasks (as they were called) for the Atomic Weapons Establishment, and our machine would all of the sudden stop steering...not what you really want happening, hoping your radiation check device did not start bleeping