We drive from Denver to Santa Cruz to SoCal back to Denver for christmas every year which means we are subjecting our second home to very cold temps on the transit days.
This year when we stopped in both NM and WY it was well below zero.
For the most part the heat pads should take care of your tanks as long as there is something in them. If not they may overheat, in which case they may "burn out" which is not a lot of fun.
A few tips, on top of what you have already gotten.
* Empty you holding tanks and put enough pink down the drain/toilet to cover the valves, they are the most vulnerable to freezing (and almost never protected by the heat pads) and since they are the low point as long as the pink was put in first it will mostly stay there.
* If you are just running electric heat, you need to open the cabinet doors, in general these spaces are kept somewhat warm by the furnace. But will become a cold box if you are just using space heaters.
* Keep the water heater on, it is not a lot of fun to replace and will very quickly freeze if cold.
Shaun & Jarese - Denver Co
3 Kids, Nicholas 16, Alex 13, Cassie 9 Years
Newmar AllStar 3950 (mid-engine diesel)