IMHO, the ones that people stick into AS windows (like you see on some homes) look ridiculous on a trailer. I also wonder how stable they are for travelling.
The split ones are fabulous, but very
The ones that are sold for homes that consist of a large box on wheels that uses dryer-vent type hoses to a window would be in the way all the time in a TT. Also, Consumers Reports says they are very inefficient (ie, they blow).
I say don't give up on a proper roof one, that your trailer was designed to take. There are several Camping World places in NH, any of whom could do a good job. And NH isn't far for an AirStreamer, is it?
You won't regret doing it the right way. Ah gah-ron-tee it!