Another option is to look for half finished project trailers. It is not uncommon for someone to buy a vintage trailer for $2k, thinking they will spruce it up with some new upholstery and flooring, only to find they are in for a shell-off. After working for a couple of years, the shell is back on, and the interior is beginning to come together, and they lose enthusiasm for the project. This is the point where you can get a trailer that may not be finished, but the "heavy lifting" has already been done, and what is left is basic carpentry, plumbing, and interior decoration.
I glanced at your local Craigslist and saw the following ad:
1975 airstream land yacht
Note, I am not advocating in favor of this trailer, but it may be an option for you--you need to do some tire kicking, inspecting, and understand what exactly has been done and how, whenever anyone advertises that they have done extensive renovations on a trailer. If you still have contacts in TX, there is an '85 in Conroe advertised for $10k--could be just what you are looking for--though I am sure you can find something that will work closer to where you are.