1) Are you using BetterEMS? If so, that's why the SUV arrives, though it isn't intended to be a fire chief. With BetterEMS it's a paramedic. BetterEMS uses the FBI2 for the SUV, but you can change what vehicle it uses in the BEMS settings.
2) PRANGER
3) Yes, and most uniforms you download will tell you how/where to install.