for asking this question but here goes anyway...
What is the purpose of the flip up license plate on our EB's rear end?
My imaginative 14 yr old piped in with "that way you can still show your plates if you drive with the tail gate down"
It is as good a reason as I have come up with. SO come on fellas, there must be a reason, or os it another of the same engineer's ideas that came up with the windshield wiper design