Is there any reason to keep the onstar mirror now that it is no longer being serviced (2g is no longer)? Also has anyone had a success with
a "smart" rear view mirror? Also I have an ARB back bumper and wondering if there is a bracket for a camera in back.

Thanks

 

Your ARB Bumper is the bracket. Drill a hole and install camera wherever you like.

Mounted mine in the factory trailer package bumper right above the hitch receiver. Tight fit because of the shape and plastic cover intersection, but works great.