I agree, But with inspection of the threads and it being a 1 inch opening, by tapping out the threads may destroy what is left of them. I may give that a try anyway, I don't think they make "oops" anode rods for larger openings ,or I may have to use plumber dope to fill in the thread gaps. I am just surprised to see the threads rusting out like that in AZ due to our climate. I always drained the tank after each camp trip. None the less it did. I have already ordered a new tank online, should be here Monday, took advantage of the holiday sales. Even if I repair the old one I'll have a spare. They are not cheap to replace.
2012 Fun Finder Extra XT-276 Toy Hauler
2007 GMC Duramax HD2500