I think ARB might be releasing JK storage drawers soon. I'm thinking about maybe getting at least on drawer (looks like 2 will fit across the rear trunk floor) and mounting freezer fridge on top with a slide. I'd lose a little cubby storage access but I'd gain some storage in the unused vertical space that the freezer fridge's footprint takes up. Food for thought...
http://www.offroadevolution.com/store/proddetail.php?prod=ARB_Outback
You could always put a rack right above the fridge too.