[Cakeman]

You should here all kinds of replies. I do the anti-freeze and flush real well before we leave each time. We have a 04 Sun Voyager and only get anti freeze in the lines and drains. I drain the hot water tank, take it out of the system, and pull a line off the inlet of the pump to fill the lines, only about a gallon. Don't take long to flush.
I never have used air to blow out the lines, but I'm sure someone will reply with that answer.
Ron