That was an amalgamation that took from long-standing themes in hot rodding. It's "just" a hot rod on a fire truck chassis with an engine from a tank--that was really only built to sell to someone lacking the common sense to not buy it.Kinda wonder if Randy Grubb from Blastolene took design inspiration from this vehicle when he made that "Tank Car" for Jay Leno.
Then again, it might be a coincidence. It's a pretty simplistic shape. Quite interesting that they managed to hit 150mph with a 4-cylinder engine over 100 years ago.