Wow! That is complete as I've ever seen on prepurchase weight considerations;) Better than I did.
It appears you verified the factory CC, them 1330, CAT 1300.
I just assume truck cab contents just gets shared front and back. Not like a long airplane, spaceship or submarine where weight location can be extremely critical ;)
Ford has three different "towing packages".
53B just hitch and electrical harness
53A standard Tow Package
53C Max Towing package
Each has different rear axle ratios and I just found out recently, each may have different thickness of metal in the frame.