My 2014 hurricane 32a (cousin of Windsport) does drain bath sink into the black tank... Other models may vary - but a quick peek under the sink will show you which direction the drain pipe goes...
In my layout - no way for the bathroom sink to get to the gray tank without a pipe crossing the hallway that I would need to step over - or a pump as it will need to go uphill from under the floor to the gray tank (which is directly under the shower - up from the floor)
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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