I've had a stare at that pic and it's probably OK. I'd guess its an early half ton WC (from the small ambulance cross if nothing else) and probably under test at the Aberdeen Proving Ground in Maryland which has hills that steep and steeper. If you allow for the fact that the side of the pylon (?) in the bottom right of the frame would be angled anyway that shot might be at the right angle. Those trucks were supposed to climb a 58% grade (that's 58% of 45o I think) but they were tested on downslope and side slope at any angle they could find. The 7.50 x 16 tyres are full of sand, of course, and the driver will be leaning right back against the rear of the cab 'cause I'm sure I would be....
Now if you're looking for something by Dodge that you won't see every day, try this one. I know pretty much exactly what this is but does anyone else want to guess ? I have a larger version of the image but can't circulate it at the minute as it will be appearing in a forthcoming article and I don't want to upstage publication......