I’ve install a part on a vehicle called a “Steel Bolt Rack”.
This part identifies itself as a “Tank” that accepts charges of “Steel Crossbow Bolt”.
My guess is that this part allows you to store crossbow ammo in it that can be reloaded into vehicle turrets even when the player is not directly adjacent to them.
Unfortunately I haven’t found a way to use or load this rack though.
Could someone please instruct me on its proper use?