Our RV was made in 1989. We were faced with the same problem but rather than replacing the hinge I figured out a way to replace the material worn away.
The style of hinge we have in a continuous piano hinge type but each hinge section is approx 3" long. The wear was a result of ALUM turning on ALUM with nothing between the moving parts. Over time the ALUM wore and the door dropped to a point where it would not close easily and rubbed on the door sill.
The solution was to purchase a bunch of stainless steel split lock washers with the ID sized for the hinge pin. I lifted the door up to expose the gap to be filled by the lock washer (~1/16" created from wear) and blocked it up at a convience opened position. I then took each lockwasher opened it up, slid it into the gap and then closed it with pliers. AH AH, I had a smooth working door!
I did this about 5 years ago and the door is still working great. I am still amazed that such a simple fix has worked so long.
It was a fast, simple, and cheap fix. Simple is good.
Robert Flight
Rochester, NY