Brown Tubing coming from the cargo area??

[Larock22]

OK, I received a call from my dealer and my X3 arrived. I'm not picking it up for a few days but I went by the dealership yesterday and "Spied" my X3... Looks Awesome I'll definitely post some pics when I take delivery.

the only think that kinda baffled me is that there were 2 brown tube lines (connected) coming from the cargo area and toward the front along the passenger side toward the roof.

Then end of the brown hose had a value-type apparatus that looks like something you'd attached to a propane tank.

Does anyone have a clue as to what this is?

I realize my X3 isn't "Prep'd" yet but I can't think of what this would be for?

Anyways my X3 is configured like this:
Mystic Blue
Gray interior
Premium package
Premium Stereo
Xenons
Navigation
Sat radio prep
privacy glass
cold weather
heated steering wheel (ah I figured for 150, what the heck)

Thanks