Admittedly I have never pulled a Fifth wheel trailer (only goosenecks) but it seems like they are less forgiving than a Goose neck especially on uneven terrain. Without having done any investigations, what are the advantages of a fifth vs a goose?
All I know of, better ride, no safety chains required, less landing gear cranking. Only downside is what Jim mentioned, if you don't latch the jaws (should be automatic) you can drive out from under it. When I had my Freightliner I always double checked the latch before leaving the truck stop in case some clown might have pulled the release, never happened to me, but heard stories.