I considered the F150 with the HD Payload package about a month ago. Had two dealers check inventory for the entire western US. They found two, both in a regular cab configuration. Unless one wants a work truck configuration, looks like special order is the only option.
Have yet to find a Ford dealer that even knows this option exists, or is even remotely aware of the potential it has to truly create/compete in the "tweener" market segment . . . the very market segment the Nissan XD Cummins was supposed to create/compete. It's sad and disappointing that Nissan is selling a truck with a gooseneck option that only has 1400 lbs. of payload (when fully optioned in its highest trim level). On the flipside, I suppose you could fault the F150 with the HD Payload package as a "poser", too. A truck with 2500-3000 lbs. of payload being pushed down the road with a 1/2-ton, gasser drivetrain.
Me, I got tired of tired of all the compromises and disappointments with all these trucks. Glad I pulled the trigger on my Ram 3500 4x4 Cummins. Due to the Ram's competitive sales environment, I paid the same price for this truck as several friends of mine paid for their new 1/2-ton 4x4's. Yes, the diesel costs more to operate. It's definitely not for everyone. But, it is a no-holds barred, complete solution to my payload requirements.