Bjesquivel,
We stay for several months at the Chula Vista RV resort near you. The entire time we are there the sewer hose is connect to our 5th wheel and to the resort sewer connection. I leave the grey tank valve open because we have a washer and dryer. I keep the black and galley valve closed until I dump about every 2 weeks. We never get sewer smells inside the RV.