Hi Dan54,
First thing I'd suggest is reading our owner-written
Water Systems Winter Usage Guide. I'm not sure what the February temperatures are in southern Utah, but I wouldn't be surprised if there are some sub-freezing nights.
Before traveling, you definitely need to evacuate the water from your refrigerator water feed line, all the way up through the refrigerator and leave it cut off.
As for water lines, water pump, tanks, fixtures, what many people do while traveling in winter conditions is to leave the trailer winterized and carry some bottled water to use the toilet and wash hands. If you prefer full use of the trailer while en route, as long as you have tank heating pads, and plan to plug into shore power each evening, you'll probably be ok if you use the furnace overnight so the coach is around 72 (F) when you start towing. Before considering running the furnace with slides pulled in, check the location of each floor register to make sure they're not blocked.