What has been your favorite 4x4 concept vehicle?

I've seen a lot of concept 4x4s up close and personal over the years and I've even had the opportunity to drive many of them. Some don't really function all that well on the street and others are built to actually work off-road. I personally like the 4x4s that work better than the show trucks.

 One of my favorites (at least today) is the Ram Power Wagon with the short stepside bed made from dually fenders. It rolls on 40-inch BFG tires, features a 5.7L Hemi V-8, 4.56 axle gears, front and rear selectable lockers, a hidden Warn winch, and a sway bar disconnect. What's not to like?