Eric,
You might want to google "vintage trailer" as there are a lot of supplies available.
www.vintagetrailersupply.com
Also,
www.perfectpolish.com if you want to buff it out.
As I recall there is a youtube video showing polishing an airstream with Nuvite products that you might want to look up. Of course, this assumes you want to polish it out.
Welcome to the site.
John