If it has the B & W Turnover Ball hitch already in place, then just get the B & W fifth wheel hitch that is made for that application.
AFAIK, from reading here, folks are quite pleased with that hitch. American made, good quality.
Here's a link to the B & W page for their Companion hitches:
Companion Hitch from B & W.
The Mad Norsky, Doll, Logan and Rocky
2014 Ram 3500 w/ Cummins/Aisin
2019 Northern Lite 10-2 EX CD LE Wet Bath
RV'ing since 1991
I took the road less traveled .....Now I'm Lost!