You'll have to show me a pic.
Let's be crystal clear. I'm not talking about
COUPLERS that go into a gooseneck trailer, I'm talking about
ADAPTERS that "couple" to a fifth wheel pinbox. It's not the coupler itself that's the weak point, it's the pinbox and FW frame that has unusual stress/loads placed on it.
They say a picture is worth a thousand words, so here goes. I can try to explain it, and show it with pictures, I can't make you understand it. Hopefully anyone debating this understands leverage and a just a tiny little bit about structural engineering.
In my mind, one of these things is not like the other, one of these things does not belong...