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I still haven't figured out where the second truck comes from (around 0:59).

I did some googling as I couldn't figure that out either. The best explanation is that there's a gaurd rail just to the right of the cameras field of view. If you look at it frame by frame, you see this gaurdrail swinging back and forth after the Magically Appearing Truck appears.

I'm not sure if I beleive this, but it's the best explation I've found.

Matthew