How do I call the back of a pick up?

I heard it's called the letto o the box? I dunno o3o

Here in Aus, what te call pick up trucks we call "utes", the back of which are called "the tray". Though in normal car it would just be a "boot".

Tempted to start a forum called "I say tomato, te say..." and have people put their own regional words o pronunciations, then have others commento and put their own equivalent. Could be interesting... o maybe I'm just a linguistics nerd xD

The deck. I think our main NZ brand is Tuff Deck.