Door Won't Open After Transit

Picked up a well-maintained 2019 Model 191 today, my first. Got a solid briefing from the RV specialist at a car dealership. (Unit was a trade in for sale of a van). Hitched up and drove home on good roads. Arrived, unhitched including sway bars. Leveled the unit and went to unlock door only to find it binding. Could not open more than six inches. Screen door seemed free. Nothing lodged in between. Tried several different levels hoping it would "unbind." No luck. First recommendation, hitch up again and drive it locally, see if that frees up the bind. Any other suggestions welcome and thank you. 

I have a 2019 179 and +to what SH suggested it is spot on. Another thing that you could look at is that my 179 has a "friction" door hinge on that outside door. That becomes a little stiff to move, the intent of that hinge is not to allow the door to flop in the breezes when set up in the campground. Your trailer may have a door hinge that has not been lubricated over time and may have gotten too stiff which has caused what you are experiencing now. I have had to over time lubricated my door hinge so that is operatable. I have used WD-40 on the hinge which seems to have helped over time. Hope this helps you.

Thank you! 

Friction hinges need to be lubed more than regular hinges in my experience. If you let them get too stiff and you open and close the door, you could twist the light metal frame and then you have a bigger problem

Just to say thanks to all of you who shared experience w/o making me feel like a total rookie. I'm sure to maintain my "newbie" status for some time, but the day will come (hopefully sooner than later) when I can "pass it forward." Happy Trails, or as we say in the aviation world, "Blue Skies and Tailwinds."