BeckyT - I would try to talk w/husband a bit before attending the rally. See if he will discuss what his reservations about having a trailer/camping are.
Then, when you get to the rally, you will have some inkling of some of the things you might discuss w/veteran AS owners. For instance, is he concerned about what towing an AS is like, is he worried about finding AS parts, does he think AS trailers are all old and falling apart? He will be quite surprised at the rally, if it is anything like the one we attended a couple years ago. There is such a wide variety of trailers and owners - new and vintage, young and young at heart, completely remodeled and kept original. And, there are many rallies that have workshops to attend. He will have to be one tough cookie not to get involved (if he likes to camp/travel at all

) Good luck & keep us informed as to how it progresses!