I am also going to remove the 25 feet or so of piping that brings hot water to the back heater. The heater lunes were looped when I got the bus. I followed them all the way to the front of the bus, just behind the front bumper. I am keeping the front heater which is built into the dash and is larger than the rear heater. The heater metal heater lines are connected to the system with rubber hose, I'm thinking I can just loop the two lines at the front so I can remove the steel piping and use the holes the pipes used to run in to run heavy power lines from the front to he back of the bus.
here is the back loop that was there when I got it. The wires were still hooked up to the heater, I just have them there for now. This pic is looking down into one of the famous Crown access holes that has to remain easy to get to
This pic is where the pipes loop to the coolant system. I should be able to connect these to remove the rest of he coolant pipes. the second pic is bad but shows more of the long long pipes
And just for fun, this is whats in two of the 5 access holes
the other access holes are the fuel sender unit, the rear hatch that has the heater loop in it and of course the biggest one id the "hood"