Opinions: FW to gooseneck adapters?

I think if that's the way you would like to go look at the Pullrite super lite hitch. Base fits on a standard 5th wheel mounting rails and the goose part fits over the 5ver pin, kind of a reverse gooseneck with the ball being on the trailer. Base is much lighter than 5ver hitches and has a 20K rating.
Other than that I wouldn't use one, 5vers are flimsy enough without increasing the leverage by using a normal gooseneck adapter.