(snip) The hose is what I would call crispy, it is so stiff I cannot even bend it and the metal braiding is split in many spots (snip)
T-man, my bus is different from most of what the rest of you have in almost every detail but mine has a metal pipe for about 12 feet from the compressor to the "oil condensor" (no air dryer) and then another 6' metal pipe over to the unloader valve (no governor on mine). The pipe at the compressor has a corrugated "radiator" cooling fin flange for the first 6 feet or so. I can't imagine a pipe that will get "crispy" and I can't imagine metal braiding (unless you're calling braiding what I'm calling corrugated fins). Is there any chance in it's past, someone has replaced the original factory pipe with one that's not as good -- and now you're paying the price for it as it deteriorated?
I'd check to see what the factory original was like and be sure that your replacement is like it.