Before I bought my 2500 Suburban, I cross shopped max tow (not max/HD payload) F-150s. I really liked that Ecoboost. I test drove a couple of them, even hooked up my TT. If Ford offered the 3.5L Ecoboost in the 2012 Expedition, I may have that instead.
Comparing the max payload F-150 package to my 3/4 ton Suburban shows the half ton is more capable in nearly every ratings. My receiver rating is lower by 150-250 pounds. My payload is lower by about 100 pounds. I have 40ft-lb less peak torque, and at much higher engine speeds. I'd pull 7500 pound dry TT with my truck as long as the dry TW was under 800 pounds. So I have no problems recommending the HD F-150 for it either.
Since I'm coming in late and it seems like the OP has already mentally accepted a 3/4+ ton, please go straight to the 1-ton especially if you want the diesel. They can have less payload than the HD F-150!
