I had that engine in a 2000 Expedition and still have it in an '04. Both 4WD, still rated to tow over 8000. As your salesman said, it will pull it, even if hooked up behind the Space Shuttle. Doesn't mean it should. Loading up the truck itself, you'll still get by. The truck itself is ready for it. But your weak link here, IMO, is the transmission.
I'm not sure what you meant by "which fully loaded comes in at 7,500." If that's as it sits on the dealer lot and you add all your stuff inside, now you're beyond my personal comfort zone but, again, a 250 should do it with reasonably safe braking and handling, just tough on your drive train.
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'11 Eagle 320RLDS
'02 F350 PSD Dually 4WD
DW's Ride, '13 Expedition
'14 Denali XL
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