For the most part, I leave our water heater full between trips. To drain it, make sure there's no pressure in the system, remove (or open) the exterior cover and then unscrew the drain plug at the bottom of the water heater. Ours is white plastic but some others are metal with an anode attached. It will drain faster if you open the relief valve at the top of the tank.
Camping World and other RV suppliers sell a water heater flushing wand, basically a long skinny rigid tube that connects to the end of a garden hose. The water stream is inserted into the drain and flushed until all the little white chunks are removed. Even with a water softener I get some buildup inside the tank so I usually flush it a couple of time a year.
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Denny, Connie & Shadow (former barn cat made good)
2000 Itasca Horizon, Cat 3126B, Freightliner Chassis
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