The Mullins is [probably a reproduction of] a classic design from the '30s.
According to
<http://www.google.com/search?q=Mullins+trailer>
an original sold for US$26K in 2006, but the fiberglass reproductions are all over the street rod scene. So you could have your own.
The floor of the tiny tear' is 4.5x3 wheel diameters (8-10"?)
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Giovanni LiCalsi is new on the board so I'll repost this:
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and now I just found this: