For the past 7 years we have been heading to the southwest for the winter. (2 Weeks away, O'boy..O'boy!) Since the DW won't leave Ohio till after Thanksgiving and every other year, Christmas, we have to travel south for a couple of days before I feel it is safe enough to de-winterize. So I'll winterize the 5'r in October and leave it that way. Taking several gallon jugs of water to help flush the toilets and for drinking and cooking. I will store them it the shower so they somehow freeze and break the water drains in the shower. This seems to worked well. By the second day we're generally far enough south to avoid a hard freeze so I'll partly fill the fresh water tank for bathroom stops along the rest of the way.
A couple of times, New Mexico the temp dropped into the teens at night so we needed the on board water for the toilet at night and dishes in the morning. Since we were at a campgrounds with full hookup. We simply didn't use their water till morning to dump the tanks and flush.
Wi1dBi11