? Equal spacing of tires important?

Having had a hanger alignment issue from new, I have found that while primitive in design, there are specs for installation to opimize alignment throughout the travel. Yes, always changing. But if that change happens throughout the parameters of what is acceptable tracking, tire wear and handling will be much better. Your truck will live a long time with the front end out of whack, but tire wear will be increased, sometimes dramatically. Given that the steering geometry is affected with every bump and so is the relationship between specific adjustment points, we are only ever going to optimize measurements. Not a reason to give up and forego attempts at alignment.