actually in my town which is volly, we have chief, asst. chief, and dept. chief and a fire inspector with their own vehicles assigned by the towns. the trucks are the command posts for any incident being a fire, mva, hazmat, or other situation. we also operate within a triboro system with all towns in the system with 3 engines, a ladder, and a specialty unit. my town has the hazmat, another has a high angle rescue, and the other has a scuba truck.
I'm not saying that they don't exist, its just that many volly companies do not have the money to spend on cars. It is simply cost ineffective to buy a new one for them every so many years with the number of miles they put on them.
That is also why i suggested the command car should spawn at a house if you wanted it in there.