[Richard]

Jon did a nice job explaining the HCV. The P in my case is actually a piece of rubber that looks like a P. In the past it may have been metal, but now is rubber.

Dean, the air line that rubbed runs just inside the wheel well flender flare. I do not know what is goes to. It has been spliced before, so me thinks this isn't the first time it's rubbed on the tire.

Yeah, I think bump stops between the axle and the frame would have prevented this. Installing them wouldn't be too hard. You would have to carefully measure to avoid losing leveling capability in the back.