Back in 2011 I towed a 29ft Dutchmen TT with a new 2011 F150 at the time, while mine was an eco boost and the towing power was impressive the most important part being the brakes and suspension were more than up to task, mine when I went through the cat scales weighed in at just over 7000lbs (5400 listed dry weight) fully loaded and ready to boondock, so as heavy as I ever loaded it. TW was right around 1100 lbs but I ran one of those tongue mounted bike racks with 4 bikes on them - probably added 200lbs on the tongue i’d Say.
Long story short, the truck you’re looking at should be fairly well matched and those old 5.4 were good torque motors, maybe not ecoboost good but still very stout, much better than the 5.3 that GM used in the same era that my father towed with and owned 3 from 2001 to 2010.
