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It is my experience that if daytime temperatures reach 40's and nightime temperatures don't fall below 28 freezing is not a problem. Any wind-break around your trailer(under-skirting) will greatly help prevent frozen tanks.
Fill your fresh water tank, then drain/store your hose. Leave all drain valves closed until emptying is required, at warmest time of day.
Open all cabinet doors to allow warm air to reach any water lines in compartments.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"