I found 1 sheared-off rivet in my sink one day. There were 3 others holding up my upper cabinet and I wasn't too worried. Planned to fix it over the winter.
My next trip I got where I was going and my upper cabinet was hanging, range hood and all, from the ceiling and no longer attached to the outer wall at all. Contents were everywhere.
The missing rivet meant too much weight
put on the other 3, which then sheared off. Lesson I learned: Don't let anything go. Every single thing in these fiberglass campers is there for a reason.