I'm in the same boat as the rest of your. Love the FJ. Love the Airstream. Mine is a little bit of different style, given it is vintage, and even though it is longer than the 16' Bambi, it is significantly shorter and lighter (original weight ~2050#, will probably come out to a wet weight of ~2500# in the end). It has only been on one trip, but it towed exceptionally well. I've towed a bunch of boat trailers, but no travel trailers before so my perspective is biased. Nonetheless, I was extremely surprised. More than enough power going up some steep grades and still passing semis going 55, and of course keeping it in 4th the whole time to protect the tranny.
EDIT: Forgot to mention that the one trip I towed it on had high wind warnings and high profile vehicle caution advisory, yet it still did not move the FJ around based upon gusts on the trailer. I was planning to be going 20 mph in the shoulder on some parts due to the wind, and I didn't have to slow down below 50 the entire day.
Tim, I of course agree with you that the biggest detriment is the reduced visibility in the FJ out the rear, but I have helped that by installing a rear view wireless camera and transmitter on the bumper of the Airstream and the receiver to a 4" LCD screen on the flat space to the left of the steering column. In simple testing it seems to work great and we'll see how it holds up on my next trip. If it is still insufficient, I will get extender mirrors and that should be more than enough.
Hopefully that's some good FJ user feedback. Glad to see everyone is FJ Streamin!!!