If you steal or hijack a fire truck you can
press Num + or Caps Lock (R3 for the PS2 and X for the X-Box)
to activate bonus Firefighter missions. It allows you to put
out cars that are on fire. You will get a certain amount of
time to put out the fire or the car will explode. While doing
these missions you might find some of the vehicles for the
Import/Export garage which can be hard to find otherwise.
This is a great way to get to know the streets which will
help you when you do missions or need to get away from the
cops. If you put out 60 cars, 20 in portland, 20 on Staunton
Island and 20 on Shoreside Vale, you will unlock the flame-thrower
at your hideout.
You can find parked fire tucks at the Fire Stations on the
different islands. They are marked on the locations map with