I'm in the other camp when it comes to buying new vs. used. Unless I knew the person selling the unit and knew how it was maintained, I would never buy used. Even among the folks who post here, there are a lot who simply don't maintain their campers, and they do need to be maintained. I don't want someone else's junk!
As for the armada, I agree it might be a bit light in the payload department for a trailer AND a family of five. You might be able to get away with it, but it might not be a comfortable drive.
I would try renting first to get a better idea of how the vehicle tows and what you might like.
