Unless a truck is working hard the vast majority of the time as opposed to being just a very large commuter vehicle, a truck simply isn't going to be one of your top choices if fuel efficiency is your main criteria.
If your roads are as bad as I envision from your description, you are not cruising along effortlessly and quickly on a nice ribbon of highway. You may not get as much benefit from aero work AND you may not achieve rated hwy mpg.
The first pro-truck argument that comes to mind could be if the roads are so bad as to inflict expensive wear and/or damage to a "regular duty" automobile and your truck choice is heavier-duty enough to not sustain such damage then in spite of the fuel consumption premium you could save money on repairs and longer vehicle life. But if trucks also get beat up and their parts are as expensive or moreso than car parts, so much for that.
P.S. Over 62,000 miles per year? What the devil?!?
