Is there anything I should be looking for with these types of miles?
Does the owner have maintenance records? Was it run in the oil patch? Or has it spent it's entire life around Vancouver?
When was the tranny serviced?
Knowing what I've gone through with my Fords (and am dealing with now!) I would walk away from that high KM truck and into a much lower KM 2011+ 5.0 or if you're feeling lucky a 3.5L Ecoboost.