John,
We live full time in our 2001 Fleetwood Southwind 36T but we are in central Oklahoma. There are weeks in the winter where the temp stays below freezing but thankfully, not many! We bought a heated water hose and I insulated the utility bay with the silver bubble wrap insulation on top, bottom and sides. I turn on a 60w light bulb in that bay when temps are below freezing. Also turn on a 60w bulb under the w/d compartment accessed by removing the bottom drawer and a 60w bulb below the sink cabinet again by removing bottom drawer there. Water line running across the mh in the metal channel under the bathroom floor can freeze without the bulbs. Gas furnaces do much better job than electric heaters of keeping condensation down indoors and keep bays from freezing. I did have the sewer hose freeze once as the trickle of grey water froze & built up to solid ice. Now have short, steep slope that doesn't freeze. PM me for more info.
