G'Day All,
A friend of mine spotted this diff on a farm walk, and asked me if I could identify it. I couldn't.
I asked a couple of other punters, and got several different answers.
So, over to the brains trust.

My guess was MH scout car - Disproved
Contestant One said: 1936/39 Ford truck?
Contestant Two said: GM Something?
Contestant Three said: Stude US6?
What's the correct answer?