Hi, The air bags are to be considered as a service item and people seem to get 5/7yrs out of them. They go because grit gets trapped in the fold of the bag and causes abrasions. How old were yours?
I'm not sure this has anything to do with your 3 amigos. It's usually a hub on the way out. I'm on air and happy with it as I tow.
Regards,
Griff