1. I'd be tempted to run those front tires on the outside rears until the tread wore down. By having them on the outside, you would be able to keep a visual watch on their wear as the rest of the tire "catches up".
2. I'm a firm believer in getting the front end aligned while the truck is loaded in its most often used state. Although suspension designs are good at keeping geometry under different loads, I still feel the difference in weight is what caused your uneven wear. If you use the truck exclusively with the TC, take it to a shop with the TC loaded and have them check specifications.