I helped a fellow in an RV park with the disconnect issue ,
His was a 2 5/16 " ball and the , ball was on an angle , in the trailer tongue , so the trailer wouldn't lift off .
We had to slide the receiver out of the truck , and once we held the receiver/ ball , square under the tongue , it dropped right out.
It was only his first trip with the truck/trailer combo, and I don't know if he managed to get the issue dealt with , said he was taking it back to the dealer.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.