Probably one of the simpler repairs you can make on a motorhome. Generally when the rivet breaks it either falls out of the hole, or you can push it out. In some cases you might have to drill the old parts out, but that is not the norm. A trip to Harbor Freight will get you an inexpensive pop-rivet tool ($11.00) with a sampling of rivets, to allow you to complete the project.

Update, Turns out it was not the rivets that let go , it was the aluminum frame for the door that broke.

I removed the door and riveted a re enforcing piece over the corner . I think I got extremely lucky

getting it squared back up, and reinstalled.

                Don