Ok, this may be getting tedious, but we couldn't allow our obsession to pass without mentioning the Citroen CX Penthouse prototype. Introduced at the Paris Auto Salon in 1980, the six-wheeled wonder was a distinctly European vision of the Winnebego Brave. As reader Matt, who tipped us off, says, "Being overtaken by these cars felt like having seen an UFO." Unidentified French object, indeed. [Update: Quick! Which one of the Transformers does the CX Penthouse resemble. Time's up!]

Citroen CX Penthouse

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Six Wheelers, and More, from Sbarro [internal]