afs do have 2 thermal image camera on the run. initial inspection is done externally using drive round by oic, in stand alone vehicle who will be in comms with crew on discreet channel. The stairs that have been mentioned in previous posts are primarily so that the afs can use them to gain entry with hose and other equip , instead of using ladders which would be more hazarsdous, however they do have a multi purpose use for evac pax also ,