You give no idea of approximate year or other characteristics. But does it match photos of the two
1957 units shown here? >
1957 Caravanner 22' - Vintage Airstream
Note the serial number range in the second line from the top of that link. Your '9226' falls within the following range -- 'Ohio | ~O-9100 to ~O-9299'. That doesn't necessarily mean that anything like 200 Caravanners were built that year.
Understand -- the first O stands for Ohio and is not a numeral.
Got a match there?