I dunno much about photoshop, so I don't know what to look for.
but
looking at the shadow from the left guys head and the driver side mirror, they both make it look like the sun is coming from above n to the right of the rig. add that to the shadows on the ground/logs, and everything in the photo has that shine from the sun coming from the right (front flare, guy on the rights back facing us, guy on the lefts gut)
if this has been happening all day the guys watching may not care about this going on, which would be why they aren't running for cover.
almost looks like the guy was looking down at something, hit the gas and bumped the front up and he is still looking down. which would be why his arm is hanging out the way it is, and his head seems the be looking down.
as for the rear tire, if the rig is bouncing up there would be no bulge until weight came down on it.
again, no pro, just my what my eyes are seeing. I like to think there are still some pictures out there that aren't chopped these days.