Regarding the hinges themselves mine were all corroding badly, so I removed them all and had them cadmium plated. I also found numerous attaching bolts had been overtightened and stripped. I guess they got a little carried away with the screw gun!
So I removed all compartment doors (undercoating project) and substituted stainless hardware for all of the screws mounting the (now plated) hinges to the coach and the hinges to the doors themselves. The hinges to the coach were easy, the hinges to the doors were very hard! Had to drill more than half of the screws out due to electrolytic corrosion. Here is a link where a couple of us discuss hinges:
https://www.jaycoowners.com/forums/f...nge-46744.html
A couple years out now and everything is still great. But I did have to have a door recently replaced due to hitting a tire alligator, so now I have two new hinges I will take off and have plated proactively.