A history of RV structural failures (not suggesting an issue with Vans design or manufacturing):
First, a 1998 bulletin from Vans https://www.vansaircraft.com/pdf/saib_faa_rv3.pdf
Others since, such as https://www.ntsb.gov/_layouts/ntsb.aviation/brief2.aspx?ev_id=20121126X24312&ntsbno=WPR13FA056&akey=1
And this one close to home https://www.atsb.gov.au/media/24397/aair200701033_001.pdf
I occasionally get invited to teach people aerobatics in their RV and I take a keen interest in W&B, mods wrt spin behaviour etc before I start the discussion.