This is something I've always wondered about and never been able to find the answer to. Today I believe I spied a Z4 roadster with something similar on the back, and I need answers! I can't bear not knowing any longer.
What's with the weird tray on the boot of the MGs and things? Like so:
My only guess is that it's trying to increase storage capacity on a car that's obviously lacking. Like a roof rack. But do people actually tie their bags to those things?!