In reply to kingoftheroad49:
More or less the answer here is no there is not such a thing. because the roof folds down in to the boot there is not much space.
There are two exceptions to this that come to mind but neither are cheap.
1, you will sleep quite comfortable in a Lincoln continental
2, you can get a soft top conversion for a classic VW camper
My "expedition" car is a convertible RX8 a tent and climbing gear in the boot, does the trick for us.
good luck. let us know what you end up with.