Make sure to check all of the water lines and drain pipes for leaks. I know that the dealer is supposed to do that, but it never hurts to double-check, as water is a camper's worst enemy.
Also check to make sure the slides line up nicely to the body when closed. Ours was perfect, but I have seen others less so.
I am positive you will indeed be in awe of your new pride-and-joy, as we sure were!