Wow that was close. Hopefully nobody was injured.
I assume that fellow did not screw down his solar panel. On one of the RV forums, maybe it was on this forum, I read someone exclusively used an adhesive to avoid drilling holes in his roof. I would never trust an adhesive alone.
Candidly, I trust my own installation as opposed to some BillyBob of unknown skill up there doing it at an RV shop. To him or her, it is just one of the jobs of the day. For me, it is my vehicle and it cost a lot and I want to be safe and not worry about it going down the road.