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LOW QUALITY sample of the first few clips here of old trailer movies.
Sample of Trailer Movies (3.8 MB Windows Media WMV file)

1936 Article on Trailers for the 1939 World's Fair (3.5 MB PDF)

1963 small trailer (up to 19') comparison article (1.8MB PDF)

California Trailer Sales 1962-1966 (96kb jpg)

1964 National Geographic ads for Airstream (286kb jpg)

Airstream Trailer weights (PDF)
This is from the Airstream Company Website.  I used to link directly to their site but they have reorganized their site several times and the location kept moving - so here it is if you can not find it on airstream.com
If you go to Airstream.com choose USA, Customer Service, FAQ you will find a lot of good information for vintage airstreams!

Follow this link to see articles on trailers (and other things) in old Modern Mechanix
http://blog.modernmechanix.com/index.php?s=trailer