We always carry at least a 1/3 of a tank of water. We also unhook when the temp gets down to freezing. It is just common sense.
We were at Anastasia State Park last week and the water went off overnight. It had no effect on us though other campers had issues.
We were in South Carolina three weeks ago and the temps dipped down into the twenties. Also didn't bother us but there were some frustrated campers there, too.
We also carry water just in case the water where we are going is questionable. On more than one occasion, we have run into quality and clarity problems (brown water, cloudy water, boil advisories); the water may be potable but we don't want it in our tank.
