I see you are in Wyoming so definitely you need to put RV antifreeze in the drains. It is cheap so it is the best "insurance" you will ever buy. A cup would probably be enough but I always use a little more. I open the drain valve under the water heater and then open the pressure relief valve to let it bleed better. Then leave a note on the counter to remind you to close all the valves next spring. There are 4 valves to drain the fresh water, gray and black water tanks. Take your manual into the house so you can thumb through it and dream about next summer's trips in your TM.
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