Not sure what I am missing here but;
OSHA 1910.178(n)(6) states:
The driver (lifttruck) shall be required to look in the direction of, and keep a clear view of the path of travel.

Now how does a backup camera allow this to happen if a lift truck operator is looking at a camera while backing up, seems like if you are spending money on a camera, why not save money and use mirrors, this works under the same principle, and causes too many blind spots.............sounds like a violation of this OSHA requirement. Just my thoughts.