Last time I saw a thread involving this hitch, I asked the following question (paraphrasing):
When using this, are you not potentially exceeding the max allowable tow weight of the bumper-pull hitch? How about the max allowable truck rating from that tow point?
Pin weight/tongue weight is not the concern here, but rather the overall towing weight. I think that most bumper-pull hitches max out somewhere around 12,500 pounds. The towing guides (specific to your vehicle) will also say something like: "tow weights exceeding XXXXXX must be towed from gooseneck/5th wheel..."
No product bashing here...haven't even read much of their literature...
But this is really the main question I have.
