Greetings from Colorado and welcome to the vintage Airstream hobby going down the Argosy road. I read the Argosy was a unique Airstream trailer, maybe more of a "prototype" trailer where Airstream would try new designs and see how the market reacted. Steel end caps and full body paint was one of those ideas.
Check out the Argosy section in the Forums Knowledge Base close to the bottom of the Forums page. You can study all kinds of information about these unique trailers.
I parked next to a beautifully renovated Argosy at the last vintage Airstream rally I attended. These folks have sure done a lot to their Argosy and it shows.
WBCCI #8607 VAC Region 11
KnowledgeBase trailer renovation threads: 69 Globetrotter, 76 Sovereign, 75 Overlander, 66 Trade Wind Such fun !