While I personally don't drive a truck, my dad had a similar need for 4x4 and reliability for winters in New Mexico (among other things). He asked a mechanic his opinion on the best engine available. He responded with Chevy Silverado (which is what my dad ended up purchasing). The mechanic said if everyone drove those he would go out of business.
I would also say to check out Consumer Reports, either the magazine or online. They just released this year's auto issue. Yet if you're buying brand new, they may not have a whole lot of tested stats on those models yet...but you could at least see patterns of reliability on models throughout the years.