Welcome to airforums.com! You'll find information on anything you want to know about Airstream trailers right here.
However, the subject of tires, and Goodyear Marathon in particular, is a hot topic, and it's possible that you won't get much solace from some
users. The subject has been hotly debated, and will never really go away as an issue, in my humble opinion, so just relax and know that you do have good tires on a great trailer.
So how about posting some photos of your rig!? We'd love to see it. And you will find that you can add your trailer information to your screen name if you go to the "User CP" page.