Never worked on a rv door, but have installed hundreds of commercial doors. 1-the 2 sides of the opening are not plumb with each other, or 2-the door is racked. You should be able to use a string across the door at several angles to determine if the door is straight. A level should tell you if the jambs are plumb with each other. I agree with you that adjusting the strike will help the door latch easier, it does not adress the real issue. If the strike can be adjusted out, and the door still seals properly, that might be the best you can hope for.
I will be watching this thread, might learn something new.
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