I must be missing something, 2.7, 3.5, in a truck you plan on hauling stuff with does not sound kosher. Get the biggest engine they put in the thing. The biggest gas burner or the biggest diesel if you want one, this is a truck not a compact car.
You don't even realize that 20' bass boat is behind my 2013 with the 3.5 in it. It pulls stupid good.