Winter Travel - First time - Tips - Suggestions??

IMO you are over reacting just a bit. I know it is better to err on the side of caution but really how many days/nights are you going to spend in a hard freeze area. Unhook your hoses at night, keep your rig interior warm, open up cabinets where plumbing comes in, put a 100 watt light bulb in your wet bay and you should be good down to an hour or two in 25 degree temps. If it gets above freezing during the day you should be good to go even with tanks full and water heater operating.