Check out
http://www.colonialairstream.com/preowned/c016.html.
Just in case I have not entered the link correctly, go to the Colonial Airstream site
http://colonialairstream.com, click
enter, click on the inventory tab, then select Pre-owned and you will see a listing for a 1976 26' Airstream Argosy (6,200 Lb. GVWR, VIN#26D6V2153). They have some photos of the trailer and it looks in great shape. Good luck!