My parents bought a camper trailer almost 25 years ago. They still use it but it has been falling apart for quite some time now.
Dad repairs what he can (which is most things), but the fold-down door he couldnt repair because it requires a special sort of flat (or flush) rivet of some sort so that when opening and closing the door it doesnt rub against anything. We decided to build our own solution using some steel dowel rod, washer and the MIG welder; the results of which are in the pictures below.
Sorry about the lack of proper pictures. If you are interested in how this was done (perhaps you have the same Coleman camper trailer. If so, then you will undoubtedly run in to this problem sooner or later) let me know and I can take more pictures.