Welcome to the forums. You have found the "right" place! It sounds as most of your questions pertain to a new Bambi... so I can't help you there. We have a vintage, 1963
Bambi that we dearly adore. Everything in her is fairly simple but has all the amenities! If you should go "older" be sure the electrical system is up to snuff... the older trailers have a total of one 15 amp service. We completely rewired and put in everything we needed. Much safer. The newer Bambi's are much heavier than the older ones so you might weigh your options. The newer Bambi's are also much easier to come by...
As for parking near Airports... no clue for you there. I do know, however, many members offer courtesy parking for a day or two and there might be someone available. With an Airstream, I wouldn't just leave it anywhere. It will disappear while you are gone.
If you join the WBCCI they also have a published list of folks that are willing to provide courtesy parking. That might be an option too.
Good luck, and welcome. This site has lots of great information.
Mrs. NorCal Bambi (traveling S Tardis)