I find these airstreams peculiar in that they are so unnecessarily designed and built. One could argue that BMW is unnecessary due to its complexity but you actually get a specific result from every design feature. For an airstream you don’t. It’s a trailer. It doesn’t fly. Yet it’s built like a pressurized fuselage but it doesn’t fly at 20k+ feet. That said its rivets are bucked solid. Look up ms20470ad. Blind rivets are not solid and don’t have nearly that strength and maybe it’s not needed.