If I recall correctly they did did one niche application. Some people used them to trundle up and down the decks of oil tankers (a bicycle would seem better to me).
Given that there are no hills to climb on an oil tanker, and the distances involved are a few hundred meters at a time (at most), a bicycle seems so much better, cheaper, simpler, doesn't need charging, easier to fix.
Given that there are no hills to climb on an oil tanker, and the distances involved are a few hundred meters at a time (at most), a bicycle seems so much better, cheaper, simpler, doesn't need charging, easier to fix.