Let me just say as a ruralie that we are not allowed to go POV. We must go to our respective stations and follow the guidelines of "2 in 2 out".
It all depends on what your departments SOP's are and should be followed. The OP needs to check with his CO to find out what his departments SOP's are and at that point maybe his CO can let him know what is standard for his area.
I would discourage departments from allowing lights on private vehicles. They offer no special privlidges, at least in my state, confuse other drivers that don' understand what a green light is for and may give the volunteer an impression of entitlement leading to aggressive and or dangerous driving. Most of these areas have few lights and little traffic which are the main time saving benefits of the regular emergency lights. It all comes down to risk benefit.