Possible Clues:

• By the sound of it, this starts to be the last sort of transport you'd have
• Procession leader, at times
• Black Cadillac, often
• Begins to listen for the last sort of transport one would need
• Here's a removal vehicle!
• First vehicle in a funeral procession
• Listens to the East of late
• A late form of transport?
• The passenger is always late for this
• Gets sound towards the East, but never for a joyful journey