Without going into the pin weight issues.......
Pullrite Superglide 14K is IMHO the best out there.
Pricey but.....Worth every penny.
Airlift 5000 bags (Or Firestone) will help take the sag out of the rear end. (
ebay)
Also replace the P rated tires with LT tires and they will be happy.
I put my hitch in myself and saved a bundle.
Check Big Discount RV
Low Priced Reese Fifth Wheel Hitches and Accessories from Big Discount RV.
Good luck.
Bill