More info with good discussion on thickness and mounting. I purchased a 1-ton 52 a few years back and used the bumper for this wall mount, it is the nearly 1/4" thick as described in the attached.
https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1276231/all/1-ton-pickup-rear-bumper.html
https://www.flickr.com/photos/advance-design_parts_co/15686100982/in/album-72157631866985745/