Hello LDNoPan ... interesting screen name if I can make absolutely no sense of it... that's a win for you! I hope you are feeling welcome at the best place on the net for Airstream/Argosy questions.
The drapes we chose for our Argosy, though relatively expensive, were from J.P. Ambruso
company out of Florida. Their quality is top notch and way above the relatively flimsy curtains on my new Safari. I can't imagine the latter lasting much beyond 10 years. Ambruso drapes feel strong and have an outer fabric that will help prevent solar/heat deterioration of the interior fabric. Without obligation to buy, they send you fabric samples and instructions how to measure. They know their business and sent back drapes that were problem-free on installation. There is much discussion on the forums about this topic. I am sure you will find your way to multiple ideas if you just use Ambruso as your search term -- much more than Ambruso will be discussed.
Best wishes -- and keep coming around, okay?