Lizzie, great photo of a hard worked late K9 in the real world. I like all the additions - put those on for a show and I'm sure you'd be told they never had them. Wonder if the channel was for use as a pusher bar or for unditching, or a bit of both - can't quite see if it's held on with wingnuts or something that would need a tool. I wonder what happened to the driver's side wing mirror, and what the big pile of canvas on the locker is?
Clive, comparing the jerrycan to the front of the body it certainly looks light stone. However I think if I had a convenient rack, particularly if packing up quickly after a job or loading up quickly, I might not worry too much about mixing fuel and water cans if they were clearly distinguished as these are, and if I knew I could rely on those with me not to confuse them. It's interesting that there doesn't appear to be a jerrycan in the proper holder.
This isn't that same truck that'd had a new driver's side screen in a previous image, is it?