FWIW, you would want a gooseneck ball hitch on a gooseneck trailer. A "fifth wheel" is a very different type of mount, usually used in conjunction with enclosed camping type trailers...where the ball (a T shaped pin really) is on the trailer rather than in the truck bed. I sometimes wonder if gooseneck folks don't say "fifth wheel" just because it sounds "cooler" but regardless, it is flat out wrong to call it that.
The truck being a dually per se has nothing to do with it. My previous F350 diesel pickup was single rear wheels and worked just fine with a heavy 8 wheel gooseneck trailer. I only went with dually on current Dodge 3500 diesel for safer capacity when hauling in the bed of the truck without a trailer.
You do need apropriate to trailer weight/capacity, truck hauling capacity with regards to springs, tires and motor/tranny pulling power of course..but you knew that already.
What you may not know, is that pickup trucks below 3/4 ton have a type of rear axle that if overloaded can break and fly out ! I mean literally, the wheel on one side and the internal axle shaft will fly out...and this is not a super rare occurance...I've seen it happen twice over the decades and have heard a few stories about it happening to others.