Camper G,
I tend to agree with you that lows at or just below freezing for only a couple hours is unlikely to cause any problems....especially if warms up to the low 50's or so during the day. And as you said, you can always put a small heater in there. If it was me, and it wasn't going to be long (less than a week.....because I can winterize so fast) before I took my trailer out again, I would leave water in it and go with the heater route. However, rather than turn it ON/OFF every day, I would be inclined to set to about 50 or 55 and leave it on 24/7. Just remember to get your rig winterized before it really gets cold.
Steve
