Quoted:
I think someone has already suggested looking at Suburu's offerings. They aren't "real" 4wd, but I think one of the wagons might be better to sleep in if necessary.
But they are "real" AWD, as opposed to what I know of many of the other "AWD" offerings starting to show up from many other manufacturers.
In a Subaru under normal operating conditions, both front and rear are always receiving some power. Standard transmission Subarus are absolutely full-time AWD, and use a viscous coupling for a center diff. The automatics use a computer-controlled multi-plate clutch pack to send power to the rear but it is always partially engaged - IIRC, you always have at least something like 10%-15% engagement on current models. (There is actually a DIY mod you can do on the four-speed autos to fully engage the clutch pack while fooling the computer into thinking it's still in control, allowing you to get a sort of poor-man's diff-lock.)
My understanding of many of the newer "AWD" vehicles entering the market is that they also use computer-controlled clutch packs like the automatic Subarus, but they start with no engagement and are FWD until the computer decides to shift power back. (Whereas the Subaru always has something going back, sending more back as needed.)