I am not sure... but I can't recall seeing any in any vintage trailers... but then lots of the vintage Airstreams didn't have that kind of design. I would look at the vintage trailer website and check through the pics and the layout sketches that are visible on some models/years.
http://vintageairstream.com/archives/index.html
We have a 1963 Bambi and have a table that is "portable" (original). The table folds similar to an ironing table, but just a bit different in dimensions. Two can sit and eat reasonably well, the table stores in the closet.
Mrs. NorCal Bambi (traveling in S Tardis)