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I spent some time yesterday trying to determine exactly what the Mammoth Dump Truck is based on - there are a surprising number of manufacturers of this type of vehicle, spread all over the world, and "giant" versions such as this have been made since the 1950s.
My conclusion - the 1:1 version was the US made Dresser "Haulpak" 830E of 1984 to 1990 - but the Mammoth is not a great scale version. Tyres and wheelbase may be 1:20ish, but width and height are way under scale. Length is way off too, so it's really a 1:32 "stumpy" version.