I was wondering if anybody ever tried something like that and whether it was a bad idea, don't see why it would be bad except maybe it would be hard to prevent water/rain to get in at the "drawer" seal ?
Here is a quick shema :

So when popped out (hollow) it is the "end" of the bed (feet), and when popped back in it could maybe serve as one of the dinette bench.
I would probably use heavy duty rails to make it slide in and out (the kind of heavy duty rails they use for servers in data center)
Anyway, was wondering what other thought about that idea.
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