I guess I can't call something a tip or trick if I don't know what it is.
Firstly, this is most probably something only in the hatch.
On the right side of the inside of the hatch, there is a round black "post" sticking out. It is only on the right side. I don't see anything in the manual about it. Could be used as a tie-down I guess, but since it is only on the right side, I have no idea.
It is probably something really obvious, but I'm drawing a blank.