It would be cool to make something like this will folding legs so it goes flat, then put it on the roof rack when you're actually driving. Then when you get there, just roll out a thermarest or pad of some sort onto it. So that it's not inside the tracker at all times, and out of the way.
I've never slept in my sidekick, but i wonder what it's insulation is like... I know in the soft top it wasn't so great on cold mornings. It would be nice not to have to set up a tent though.