The battery boost switch should be a momentary one, i.e. spring loaded and returns to the open position when you release it. If the switch you are looking at has two positions and stays in either one, it maybe has some other function? Not sure what, though. My '04 didn't have one labeled like that (and I'm guessing your '06 didn't either).
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC