Hi, Having lots of fun with your mod!

I wanted to ask a question. When I hover over a vehicle roboport it says it can be placed in an artillery wagon. This much is true but what is the function of it since the inventory of the artillery wagon can only hold ammo, thus no bots. is it just to charge them up from nearby wagons if needed? I can't think of any other use atm. I've been trying to figure it out but i am still quite new to the game and can't get there on my own so I thought id ask :D

Many thanks.
edit: sry this was meant to be posted under krastorio 2