I did not mean to imply that there is something wrong with the door of this specific camper. Our experience with the small fiberglass campers is that door sag is a typical problem. We purchased a little FG camper a year ago (it is much older than this one), and didn't know to specificly check the door. It has been a problem for us. It leaked and had caused rot inside the camper. Like I said, it is just because of our experience that I would insist on seeing additional pics of the entire door and how it closes.
As I look at these pics I don't see the lower part of the door and how it fits to the body. it raised a red flag for me...again, I'm not suggesting that there is a problem with this door but if it can't be inspected in person, I would request additional pics, specifically of the door, before a purchase.
Hope this explains my post.