I did a lot of research on this with the consensus being.
Volunteer responders in most states must have a state issued permit to operate any non factory lighting and the lighting is only legally used en route to the station for response to an actual emergency. The type of lighting allowed differs from state to state and for the most part rear facing strobes are a no no.
As for construction vehicles IE plow trucks, material delivery, electric company vehicles and the like. The use of the lights are permitted only when the vehicle is parked in a roadway performing whatever task is causing it to need to be in the road.
Its pretty simple guys. You dont see state plow trucks or electric company trucks rocking disco party lights while in operation on the roadway. The reason you do see LE, actual fire trucks, ambulance and other emergency vehicles with bright flashy lights is because the drivers are highly trained in emergency driving. Joe blo volunteer firemen maxing out his civic with a christmas tree wrapped around it on his way to a bon fire is not only very unsafe its just plain stupid.
Anyways i could give a crap less what anyone does to a truck im just giving advise on how not to receive several citations for improper lighting. That way you dont come back here griping because you where handed a $300 ticket for showing off your sweet stobe lights to that honey next to you at a stop light.