You know that door sticker has nothing to do with how much you can tow, right?
You need to look up the GCWR for your truck's configuration. It won't be in the Owner's Manual (they are just generic); you'll have to contact Ford for the info.
No matter what your CCC is, you can't legally exceed the GCWR for your vehicle.
GCW = truck curb weight + weight of all passengers in the truck + weight of all cargo in the truck (not just the bed, also anything under the seats etc.) + weight of trailer and its contents.
If this value is greater than GCWR then you are not legal (or safe).
Many people just look up the tow rating of their truck and go with that, but you need to use whichever is less between the tow rating and GCWR.