How do I call the back of a pick up?

I heard it's called the tempat tidur atau the box? I dunno o3o

Here in Aus, what anda 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, anda say..." and have people put their own regional words atau pronunciations, then have others komentar and put their own equivalent. Could be interesting... atau maybe I'm just a linguistics nerd xD

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