Tailgate
Spinning off of Mac's "just your knowledge" thread... There was some discussion about the purpose and function of the tailgate. Have a look here.
The most relevant part is:
In reply to:
The primary purpose of using a tail gate is to achieve nose-first bottom skin expansion (versus tail-first bottom skin expansion). There are many benefits of nose first bottom skin expansion – just ONE of which is the minimal chance of a line over or tail inversion.
The relationship formula is not:
LINE OVER is avoided by TAIL GATE
It is:
LINE OVER is avoided by NOSE FIRST BOTTOM SKIN EXPANSION which can be achieved by using a TAIL GATE