Answer:
A big shiny black car nobody wants to be a passenger in.
Four kings of whom I am one lord. Often on deck but never on board. Though I have a large heart, I am always seen at war. During which I always wear a suit, but never a suit of armor. Who or what am I?
I know a word of letters three, add two and less there will be.
Sometimes you feel it weigh a ton. Yet it is nothing, but somehow still there. Makes you uncomfortable around anyone, But speak its name and it's gone.
It is something you will never see again.
I am a room that has a roof but no walls. What am I?