I have a new 2020, issue very hard to close the door without slamming. Checked alignment of latch on door with the bolt. Off a bit, loosened bolt and tapped bolt with rubber mallet, tightened bolt and door closes easily, from outside or inside. But, handle lock very hard to open from outside and key hard to move. I used a graphite spray lubricant as it will not collect dust and have major improvement, not perfect but better.
2020 28' Twin Flying Cloud-(Our 5th Airstream)
USAF Master Training Instructor (TI) - 68-72