Lumberjack, I would venture to say the best way to answer your question is to say that rigging will always be left up to imagination ( im sure thats nothing new). Although this is not a practical plate to use for such things as lowering sections of trunks, this is usefull in my eyes for light to medium rigging. I can see the practicality of having it in a parking lot or a place where you can get a truck but dont have any anchors or useable anchors ( saying you have a property that the customer frowns on tieing off to other stuff around for some reason.
On a side note, the space between the biener holes and the back slot hole for the ball is the same. Meaning one would be able to still use this in a normal manner as well. If one chosses not to use the slot with a biener the back two biener holes are there for that reason.
My original thought of making this plate was for a first responder say pulling up to a car over an embankment or bridge, can deploye this plate fast and have a rescuer with the victim in a short amount of time ( no fussing around with tieing an anchor to anything). Also I know that once a truck is used as an anchor on a rescue scene it is not to be moved. So now because of the plate being there, there is also a place to rig a MA for hauling.