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Your door may have hinges similar to what were used on some of the older travel trailers, 5th-wheels and even some of the motorhomes. They are a leaf-type hinge that were/are made by Atwood or Lippert.
Here's a Lippert leaf hinge sold at etrailer ...go HERE
Here's a place you can see some Atwood leaf hinges at Fleetoodhinges.com ...go HERE
I'll attach a video below of hinge replacement on a Keystone trailer that is interesting to watch in case your door is similar: