My floor plan (2014 Hurricane 32A) wouldn't be possible if the bathroom sink drained into the gray tank.... unless I wanted to step over the drain line each time I walk from the kitchen/dining area to bedroom
The sink/shower/gray tank are along the passengers side with the gray tank under the raised floor of the shower.
The toilet/bathroom sink/black tank are on the drivers side with the black tank directly under the toilet.
Water would have to flow down under the RV to clear the floor - and back up into the gray tank on the other side - gravity and physics say it ain't gonna happen.
When dry camping, our gray tank ALWAYS fills first - so offloading the bathroom sink to the black helps...
Dry camping for an extended time is conservation mode... 'RV showers' (use the water turnoff when lathering, etc) and not leaving water running when brushing teeth/shaving/doing dishes..
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