I would agree; it's rare to see a "for sale" sign at a
rally. I've attended 7 large rallies and have seen about 4 trailers total that were
for sale. The earliest Texas
rally is Bluebonnet in the first week of April.
As a temporary measure, have you considered renting. There is a company in Princeton, Texas that rents stick built trailers, hi-los, and popups (but no molded fiberglass).
http://www.popupcamperrental.com/
Tom Trostel