Hi,
Airing Down (within reason) is what I am going to try next. My work truck is a 3/4 ton Ford usually with a a heavy ATV/ramp/tools in the back so we run 10 ply, on/off-road, high pressure tires. I am going to reduce the pressure by 25% and see if that helps prevent the stone damage. The trouble is that I also drive a lot of highway to get to the gravel access roads so airing down may effect my gas mileage and highway handling, well see?
Mike