I'm not aware of any means of shutting off water to the external kitchen and shower. There are no shut offs for separate or individual water systems that you mentioned. Wrapping the pipes with heat tape is a good idea and will go a long way to keep your lines from freezing.
Some people put a small heater in one of the storage compartments where exposed lines often run through.
Running your furnace may provide a very small amount of heat to find its way into the underbelly and to your tanks but by the time it gets there and into the basically uninsulated underbelly, the tanks are not going to be protected that much. If you have time, I'd remove sections of the coroplast, go into the underbelly and add extra insulation around the tanks.
Leaving the pump exposed might be something to consider. If it is located behind a panel, take the panel off so that some of the interior warm air will reach it more easily. A small space heater placed near the pump will keep the interior warm as well as the pump and water lines that enter and leave it.
Making use of foam pipe wrap is also something to consider. You can't put electric pipe wrap around all of the lines but putting foam pipe wrap over any other exposed pipe will help.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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