On my 2014 Duramax dually the electric/hydraulic disc brakes on my trailer would not work with the ibc. The owner's manual stated this. I had to take it to the dealer and they ran a seperate wire to the back and I now use a Prodegy P3 controller. ...
Allen8106 is correct with his information. I have the same water heater. Just leave the switch on and the propane on and the heater will come on for a few seconds every once in a while to keep the cubicle warm. There is also some heat tape around ...