Hi Marianne and Dave!
Welcome to the forums.
The Airstream campgrounds operate thru the WBCCI. Here's a couple of links:
Go to www.wbcci.org
, then click on suggested links...you'll find a list of WBCCI units that operate their own campgrounds.
We stay several times a year at the Washington unit located near Olympia, Washington. Their website is www.waunitwb.com
, and they have a lot of links, too. I think some of the clubs rent to members only (membership info is available at the WBCCI link above), and others rent to anyone with an Airstream.
Good luck, and happy traveling!