New user of T@B 320S trying to fill water tank

I have found that the only way I can completely fill the fresh water tank is to raise the front of the trailer as far as possible. It fills much faster and less air gets trapped in the tank. 

@elainep, city water and fresh tank water do the same thing as far as use in the t@b goes. When a hose carrying city water is hooked to your t@b, the city water pressure pushes water through the systems of your trailer (always use a pressure regulator in this case). The water will move through the t@b to the faucet/s, shower and toilet. The alde has a separate inside heater for the water, just like your house has a separate water heater. IF you are somewhere you can't get city water hooked up, like a rustic camping site or an overnight stay in an approved parking lot (like Cabela's or some Walmarts) then you use your fresh water tank for the same plumbing purposes. In the course of using the fresh water tank, you turn on the water pump to provide the pressure to push water throughout the trailer. The alde heats the trailer with a separate system filled with a heating fluid called glycol. In the winter, if you are from a climate with freezing temperatures, your trailer must be winterized, that is all water purged from the plumbing system, or it freezes and does costly damage, BUT your alde trailer heating system, filled with glycol, can continue to operate, and heat your trailer, so that you can use it in freezing or below temps. I know I just wrote a novel, and others have given brief explanations, but it just sounded like you needed some details and clarification. I  hope this helps. -Denise