The biggest problem with not winterizing is that your water lines could freeze. Once the temperature gets below freezing, any water or moisture that is in your lines will freeze, causing damage to your lines that no one wants to repair.
The best thing to do to keep your lines clear and free of freezing is to give your lines some RV antifreeze You should winterize your RV if you are leaving your RV outside and the temperatures at some point will be below freezing. Once temperatures hit below 32, you could see all kinds of damage when you fire it up in the spring.
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