You can't or really should not tow anything behind the airstream, especially the older ones, the frames are not built for it, if you bend/twist the frame at all you could crease body panels and or create an ongoing nightmare of structural issues. You might be able to triple tow with the bronco in the middle, but i'd worry about frame and suspension issues with that as well, all of that plus triple towing is illegal in many states for a reason, it can be dangerous and extremely difficult to navigate.
The big flatbed trailer for both would be the best/safest option in my opinion but you could get into clearance issues.
If you are set on it I'd look into that option. I would forget the others unless you want to trade your current TV in on a rollback/flatbed truck that would handle the bronco plus the tongue weight of the AS.