I think you should find yourself a VW Vanagon Syncro (4x4).
Don't know first-hand about the off-roading ability but surely good enough for jeep tracks and fire roads. Should be fine in snow w/ right tires. Holds plywood sheets, and stuff up to 12 feet long. Particle filter, heated seats, sunroof, ESP - I guess you can add a bit of that, and will have to be a man and cope w/out the rest. (Where do you live, Beverly Hills?)
Then kit it out for camping - it should already have the Z-bed (rear bench that folds flat into double bed). Don't need the full Westy camping interior, make (or have a cabinet maker do) a minimalist (and removable) kitchen box. Don't need the pop-top, though it is a nice-to-have.
If you really want to, buy a junk Westy and transplant the cabinetry and pop-top. But you'll lose some hauling room.
Main weakness, when you have done all that, is that the Vanagon is pretty gutless. An engine transplant solves that, and the Subaru-Vanagon guys seem to have it all figured out, there are detailed instructions and kits w/ all the needed adapter parts to get a 150HP Vanagon. Personally, I just take my time. After all, you have a 911.
That's my vote. Go to thesamba.com and ask in the Vanagon forum for more (and more informed) advice.
Specs
http://www.vanagon.com/syncros/technica/car-and-driver/index.html says 8.3" ground clearance.