Water heater tanks are designed to never be totally full, yet I have heard of and seen one that ruptured from freezing.
Its called winterizing and the same thing must be done to an RV.
The 67 year old retired plumbing contractor that has a cabin in our community,(Hannagan Meadow) winterizes most the cabins in the area every fall.
Your credibility is waning fast, but its always interesting and sometimes quite entertaining to read your posts. Keep up the good work.
Next spring, when there are posts about frozen batteries, ruptured piping, water heaters, holding tanks, etc etc, I will be waiting for your explanation. It can and does happen whether it should or not.
It happens every year to those that are new to the RVing world and those that do not winterize.
When water freezes it expands, applying pressure equally in all directions.
