Wow, I thought that issue had been fixed years ago. Our '93 1208 did the same thing but we sold it before it got bad. Notice how the door gap is wider the higher up it is. That's your frame flexing. Because the door creates a gap in side wall rigidity, as time goes on and the trailer bounces down the road, the frame slowly bends in the area below the door. Eventually this leads to a cracked frame, but it takes many, many years to get that bad.
The short term fix when camping is to put a small bottle jack at the corner closest to the door and raise up enough to close the gap. In fact, if you watch for older Jayco pop-ups some people have had to put an extra latch on the outside of the door to keep it from opening up while traveling.
The long term fix is jack it up, make sure the frame is straight by lining up the door, bolt a 6" long 1/4" thick steel plate inside the frame, and find a welding shop who can strengthen the plate by welding it also. If you don't weld it, the bolt holes will just round out after a short time and you'll be back to square one. This is how I fixed my '72 Jayco pop-up. I bought that one in late '91 and what a piece of junk, I knew nothing at the time about trailers. It was a good learning experience though!
Originally Posted by TNCraig
Looks like the shaft on the latch is bent. If you can disassemble and straighten it, then it should work better. Worth a shot
Unfortunately, the shaft is bent because the pressure on the door being forced open while traveling bent it. He can fix it, but in one or two trips it'll just be bent again.