Thanks again for all of the great advice. I will check the size of the tank with a gallon milk jug. I also will make some different arragnements for washing dishes. Lol. I do like the idea of washing dishes in a tub and running it down into the black water tank. Also I just purchased a portable tank (25 gallon with wheels and a tow bar). Waiting on it to arrive. Things I should have thought about before the purchase. Although I am limited to trailer size due to the tow vehicle being a Toyota mini van.