How do you feel about those dashboard placards

Look at it this way. It is the campgrounds way of taking inventory daily. If you do not want your address on the placard, take it off, they could care less. They are interested in the date in and date out.
If this sort of thing upsets your wife, what she doesn't know about the world of cyber information would send her to her grave early. Be careful but don't get paranoid over it. I have a sister that lives in hell worrying about stuff like this.