That is the question....
I concur with others... it may depend on what you plans are. Usually if it is a one night stay, we keep hitched up. But, if the space doesn't allow, or if we are there early and might go somewhere, then we don't. A lot of it is personal preference. Many times when on a trip if we are tired... we just stay hitched and do all the extras in the morning. We try to make a habit of dumping the black water any opportunity we get. Our little Bambi has a small holding tank, and it reduces weight.
The important thing, is to get to be out with the Airstream!
And keep her safe!
Mrs. NorCal Bambi (traveling in S Tardis)