Cummins is not able to replace heater hoses!

I had to replace a hydraulic hose on my previous coach on a FL chassis. The hose ran from near the front of the coach all the way to the back slide room. It was bundled together with other hoses, wires, air lines running inside the frame rail. It was a messy, time consuming, four-letter-word-producing process. I can't imagine how much time it would take to replace those hoses that run from front to back on these things. It can certainly be done but it will be labor intensive for sure.