Sounds like an Airstream.
Try:Or google Vintage+airstream
Airstream trailers and GMC motorhomes have been defined as the classics in their respective markets. There are a lot of enthusiast's, clubs, websites, mail lists, etc. dedicated to them. If it is an Airstream, You will be inundated with tech material. I have a GMC and the support is just amazing.
-Chr$ NAR 79536