If you want a short box 145" WB, find a 7650 GVWR, that is only slightly loaded with options that you need/like, (XLT-XTR) this will give you the highest payload capacity. Once you start looking at trucks with the fancy leather pkgs, they seem to really lose payload. If you want the 157" WB then the 8200 GVWR is your HD pkg half ton(special order), the 7700 GVWR is the next in line. I'm a firm believer in the 3.73 gears if you do any towing....
2012 EB F150 SCrew XTR 6.5 Maxtow 3.73 7700GVWR, 1700# payload and lots of goodies.....
2012 F150 & 2008 Jayco 23FB
The border between Canada & the USA is a typical human creation. It is physically invisible, geographically illogical, militarily indefensible and emotionally inescapable. Hughe Kingsley