There were one or two rivets missing on my coach when I bought. During the “zero-out” process, Jeff Rowe replaced them. I believe he used a blind rivet (“pop-rivet”?). Probably stainless steel. The setting tool probably has long arms to give you lots of leverage to set the rivet properly. I borrowered a long handled tool from a race car friend of mine to set some rivets on a project at home before I bought the Prevost.
Maybe Jeff will chime in here with the specs on the right rivet and tool to use.
I’d be interested to know what causes the rivets to pop like that. I expect that I will be adding that special rivet tool and a box of rivets to my tool box eventually.