This won’t help you much but when I first picked up my truck I wrote to the Forum here and Ford as the various labels, stickers, documents seem to indicate we couldn’t even load our TC empty on the truck!
There was the Consumer Information: Truck Camper Loading weight and weight on the door label. These didn’t match up at all.
I think I wrote NHSTA at the time, I’ll see if I can find the mails and put any useful info on here.
All in all I recall thinking there must be a way to do this so it just plain makes sense and this question doesn’t keep popping up.
PS: Is there a way to search the forum for my own posts?