I think you might be awfully sorry if you don't have the maps. They show the locations of services, including camping locations (both established and make-shift), as well as paved alternatives where they exist. They also have important notes about various part of the route that may pose issues. It's only the cues and mileages that are written N to S. The lines on the maps can be followed in either direction. You would simply have to read the cues in reverse and do some simple math.