I had the passenger rear one get ripped off in a car wash, but luckily I saw it fly off in my rear view mirror. I had them stop the wash and retrieve it for me, and was also lucky that it wasn’t damaged. I drilled and tapped into the actual brackets underneath on both sides and used stainless #10-24 screws to prevent them from ever falling off, or getting stolen.
I haven't ordered one yet and was wondering if this was something that could be remedied fairly easily. Thanks for the idea!