You do realize you’re talking about people who rip copper out of huge AC units and even railings from churches. I’m sure anything robotic would be quickly grabbed and sold for scrap. The armored car idea is the best-but if you have to go to that extreme you might as well use an armed tank. WHY service an area that dangerous at all? Why is selling $5 worth of dough and sauce worth endangering a life?
Not if robo-pizza guy (RPG) was also equipped with a sensor that electrified him when some unworthy person tried to grab him. Remember RPG could be visually monitored by people back at pizza central for these sorts of events.
The intention is that RPG would be a dangerous uh "person" to try to rob. Very dangerous for certain feral types.