Wintering in the Northwest

[Lenny K]

My daughter and son-in-law are planning on staying in their 27 ft Coleman trailer for the winter here on Vancouver Island while their house is going to be built. It has about the same climate as Seattle.

So my question is what do you do extra besides putting heating tape on the water hose and insulating it? They don't have heated holding tanks but their trailer is covered in on the bottom.
They are thinking about putting skirting all around but I don't think it is necessary for this climate. Your thoughts on that?
I did recommend they get a good tower heater and a good dehumidifier to control the moisture.
Any and all thoughts are welcome.