Jeff1024

Not sure what you are asking, you are correct your payload is GVWR - Curb Weight. In your case your GVWR is 7200lbs, you have 1273 of payload so working backwards the curb weight of your truck as it rolled off the line is 5927.

There really isn't any grey area in the calculations, Ford says your truck should never exceed GVWR. Do people tow and haul over that number, sure. Do their trucks start on fire as soon as they hitch the trailer up? Not usually. I woldn't feel comfortable doing it, but thats just me.

Oxlander

You're correct. Based on the numbers you have circle that corresponds to 15,500 GCWR that you were seeking in your initial post.

Like others have said, don't pay much attention to the numbers you have circled.

Use the GVWR (15,500), GCWR (7,200), and Curb Weight of your truck to get started at the towing calculator. Then plug in the numbers for the TT your are thinking about buying.