I had a 2280BH and had problems from time to time getting the door frame to line up. The roof AC and awning tended to pull the roof off center quite a bit when the trailer was level. I ended up having to guy wire the roof to one side to prevent it. I found that if I forced the frame to line up without doing that, the door behaved as you describe. It MAY be that your door frame is being put in a bind somehow.
2012 Chevy Tahoe LTZ - HD tow package
2017 Rockwood 2703WS Emerald Edition