Under body rust on a Brand New 5th Wheel?

I ran across the same thing. A dealer had the floorplan on a new 5er we wanted. But upon looking, the entire underside metal was covered in rust. Dealer said it was delivered during snow event around factory on salted roads and they would sandblast and repaint. Went shopping and found the exact same model/floorplan at a different dealer a little farther away. No rust at all. And they offered it at a lower price. Bought it. That was 11 years ago and it still has minimal rust.