some other folks on the list might want to know about these folks ...
they make a kit to convert your rear seat into a queen-size bed. i
can't speak to the quality or ease of installation for these folks ...
never bought the bed. got the curtain kit, and though it was expensive
for what i got, it worked well and was easy to install. :)

http://www.zproducts.com/vwbedkit.cfm?cid=96043

that's the bed page.

hope it helps.
joel