Those solid-walled, self-contained, externally carried camp kitchens are pretty cool - minimal setup and space friendly. For years we've happily used a $100 Camp Chef table for our outside cooking needs, but we carry ours in the back of the truck under cover. It does fold up small and still carries a stove and everything we need to cook our meals, but I don't think you'd want to permanently carry it on the outside of your van.