We pulled the heater from the rear of the bus. Cut down the hose and looped it back onto itself. We didn't really loose much anti-freeze at all.
We also kept the electrical wires hooked up that went to the rear heater. I'm not sure of Hubby's plans for it though.
This way we still have the heater up by the drivers seat to keep the driver warm and if push comes to shove I have plenty of blankets to wrap me & the dogs up with. Though the dogs generate enough heat all by themselves.