LAFD Fire Engine 2 #202 doesn't have lights on at night. I mean no wig-wags, no beams, no tail lights, nothing. In the same time Engine #204 is all fine.
Also I have question about LAPD markings on a tailgate. I believe they're police stations numbers, at first those seems a bit random, but I can see some kind of pattern, #17 is the most common. Can you say something more, is it intended as a station on the map, am I correct? If not, maybe it could be an additional idea for future vehicle's upgrade system u mentioned?