Poor quality control

I have never aligned the tires on my coach. The tires wear perfectly even through 61K miles. When I change tires every five years, the tire tread still looks like the day they installed them. I do not believe that the alignment changes when the coach is loaded. You can only put so much weight on those compartments. Maybe the tires wear even on mine because it has a I-beam with half a leaf spring and air ride on the front. It is possible that IFS could have more of an up and down movement which could cause uneven tire wear. Seems like I have read on these forums of some new coaches having problems with uneven tire wear. But it is hard for me to believe that it is caused by the load. I believe it never was adjusted right coming out of the factory.