Fifth Wheel to Gooseneck and need for off-set adapter

If there is anything in this world which has NO consistency, nor has any standards other than the basic expected necessities, its the RV/trailer industry. With sooooo many options and configurations out there, in combination with the many years, makes and models of trucks available..... There is zero way anyone can or should say with absolute definitiveness that "whatever" setup works or doesn't work, without including the words "for me" at the end of the sentence.