I don't have a Crusader but a couple of things...
Most fresh water tanks have their own drain.
Some with a petcock directly on the side of the tank, some with a valve and a remote line that comes out (usually) near the low point drains. You are going to have to do some exploring if your dealer didn't show you during your PDI walk through. (pre delivery inspection)
When using your antifreeze port...(or winterize valve as you referred to) Most times there is an actual valve that has to be turned to allow the pump to draw from the antifreeze port instead of the fresh water tank. Did you turn this valve? You mentioned turning the water heater valves but no mention of turning the fresh water tank bypass to antifreeze port valve.
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