Strangeness on the M4

So, driving around Durban in my MGF I pass on the M4 a flatbed truck with a single cardboard box strapped onto the back. A standard microwave oven sized cardboard box. All alone in the middle of the flatbed. It looked just a little odd having such a small box on the back of a big truck.

Then I passed another truck. Same exact brand. Also with a single box. And 3 more.

Curses I need to start travelling with a camera. Why on earth 5 brand new trucks - all the same brand and model - are needed to transport 5 small cardboard boxes is beyond me.