JBYRNE7844, I always give the open size, which in my case would be 27, as I have a 2720. You wouldn't want them to put you on to tight of a site and then couldn't open up. As for as what to call it, our dealer said to just say it's a travel trailer, as you are fully self contained. We have never had a problem, have gone cross country once and thinking about doing it again, just be ready for a lot of people watching what you are doing.
Happy camping.