I suppose that you have already given some thought to this but just in case....
If you want to spend any time in National Parks or BLM lands/Natl Forests these trailers are all way too big to gain entry.
Also just like in boats the longer the trailer the more it will cost you to insure, park (sometimes), haul etc.
When I was looking for mine I was in a similar situation. My 31 foot Gulfstream has one bedroom and a slide-out with a bed a place for a tv and some walking area. It's not perfect but I'd rather get into the natl parks.
Just a thought. Good Luck on your search.