Whether you’re traveling or storing your Unity, once you reach (conservatively) temperatures of 0 degree celsius / 32 degrees fahrenheit or below, it’s time to make sure you’re winterizing your RV. While it’s fairly safe if you’re only winterizing at -3 degrees celsius / 28 degrees fahrenheit, prolonged use at that temperature will result in freezing.
For more information on winterizing your LTV, have a look at the Winterizing Truma AquaGo article