Actually I'm pretty familiar with how many tanks are on a trailer. I know that there is a fresh water tank, grey water tank and black water tank. I wasn't positive that my husband dumped the fresh water tank as well, until I doubled checked with him. I don't understand why you keep modifying your response, months after I reviewed your company. It's time to move on and stop coming back to my review and focus on improving the customer service for current and future people who decide to rent from you.