[746F7475]

But again what if he needs to take a shit? I don't know about you, but I can't do my business and wipe well in less than 3 minutes, so the trucks stand there. Then there's the ~30min lunch break, that's 10 trucks just idling in the worst case scenario. Then just plain human interaction.

It's not just a factor if he can possibly fill every truck by himself, there are other human factors to consider. You need at least two men manning the station all the time for the autonomous trucks to refill there + maybe a spare guy for regular folk who come to visit.