The axles on a Unimog do not go to the center of the wheels, with portal gears they are on the top part of the hub. The Unimog is quite well know for this tech (that and the Volkswagen Kübelwagen, aka Volkswagon Thing)
http://howdywilcox.org/wp-content/uploa ... r_2006.jpg
oh, and for the wreck, maybe have some of the canvas bed cover gone or removed? (could be done in texture but its food for thought)