First thing to do is get a carpenters framing square 1'X2' and check the door for square , by putting the square on the lower outside corner . My door has sagged nearly a 1/4" and there is no way to adjust the hinges to compensate for a sagged door.
I have managed to adjust the striker for ease of closing and had to enlarge the deadbolt plate in the frame for it's operation.
One of the joys of a 20 year old RV I guess.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.