My provisioner is all by his lonesome self and I would like to start another one but the other settlement is a good ways off. I know that they are invincible but I was wondering if you could assign extra settlers to act as caravan guards. All the other caravans in the game have at least one merc guarding them. I don't want everyone to think that I am so cheap that I don't care about protecting my trade routes.

I haven't seen any obvious way to do that, but there are no obvious explanations of how to do anything regarding settlements so it doesn't mean you can't. I'll give this a try my next session and see if I can actually do that. I would think that if you command your prospective guard, then click on the provisioner (or maybe their brahmin?), IF you can assign them as a guard it will confirm with the prompt "this task has been assigned" or whatever. I guess it would help to make sure they're armed as well. Not sure if this would just swap provisioners, though.

I ran across one of my provisioners in the world the other day and saved them from a mirelurk.

Does anyone know if they are killable or unkillable? I'm on PS4 so I have no way to open console commands and check.

There's not that many settlers around. Perhaps mercenaries for hire?

How do you even get a caravan. I was exploring one time and ran across one that was offering to sell me one then a robot came out of nowhere and killed her before I got the chance to buy it.

The Provisioner finds their own Brahmin.

(and boy can they run when they need to )