The fresh water drain is usually located below the unit at the fresh water tank.
How careful you have to be in winterizing depends on your location. Around here, close is good enough. In fact, most years I don't winterize at all.
Having said that, once you 'blow out' the lines, check the suction strainer on the pump and make sure it doesn't have any water in the bottom of it, and you should be good.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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