Just curious if anyone else has installed a doorbell on their A/S? I found a wireless doorbell at a local hardware store (ACE Hardware) and thought it was too cool to pass up. The button attaches somewhere on the outside, of course, with two-sided tape and the chime can go anywhere on the inside that you can think to hide it. The button uses one 'AA' or 'AAA' battery (can't remember which) and the chime uses two 'C' batteries (if memory serves correctly). So, the whole thing is wireless and installs in just a couple of minutes.
Not quite like "The Long,Long Trailer" since you gotta push the button to make it chime, but still cool, I think.