Alignments, Odd Tire wear, etc.

[Chamberpains]

Your tire wear sounds pretty normal. Michelin's have a tendency to wear abnormal after they are half worn or worse yet at 1/4 tread with some spotty edge cupping. Your problem sounds like what Rawze described. The crown on the road for water to run off makes your truck lean to the right at almost all times.
I combat edge wear by taking turns slower (especially in parking lots, tight fast turns murder the edge of tires) and rotating the tires more often which includes breaking the tire off the rim and flipping it to the other rim every other rotation and then spin balancing them. I get upwards of 200,000 out of mine.