Towing accessories for 17S XD 4×4 gas 8ft bed.
 

First post, here goes.
I have a 2017S 4×4 XD gas. I'm picking up UHauls largest open Utility trailer to empty my garage. I believe I need a 2 inch ball on a drop hitch.
I'm a firm believer in over kill and over engineering.
Is the factory hitch (part bolted to frame) class 4 or class 5? It has a 2 inch receiver.
What is the heaviest duty highest capacity drop hitch that I can get for it?
What is the highest capacity 2 inch ball I can get for said drop hitch?
For the 5th wheel hitch,, does it sit to where its recessed for hauling sheetrock in the bed or does it have to be removed..
I've towed a bit in my days but mostly amateur.
Truck is a beast hungry for work..
Thanks

https://cimg9.ibsrv.net/gimg/nissanf...49aeb5aa77.jpg