Here's a blast from the past that should have had a much larger impact; instead it's almost unknown. It was built on a 1937 REO chassis, a truck manufacturer in Lansing, Michigan. Plume is an Australian oil company, so I assume it was an Australian design. Can our Aussie friends tell us more about this wonderful device? This first image is fairly well known, the others were very difficult to turn up. What is the monument by the truck?