If you are 100% sure you will never be without the water hookup then you do not need a fresh water tank. The pump will not be needed either other than perhaps to help winterize if you are going to leave the trailer in the cold weather. Winterizing can be done without the pump but it is much easier with it. Again, no FW tank is needed for that. It looks like you are in Maine and you will need to winterize your rig. You can purchase a hand pump to pump the antifreeze into the lines through the regular hose input on the outside.
When you are hookup to a permanent water supply (city water or well) the water heater, all pipes and faucets, toilet etc. are all connected to the city water pressure and no pump is needed. Everything works as normal without it.
You would simply connect your hose to the water supply and turn it on. It would be a good idea to have a filter and a pressure regulator inline on the hose before it gets to the trailer. Most put the pressure regulator right at the water supply outlet and the filter just before the trailer inlet.
You would also need to bring in the hose and/or filter anytime a freeze is indicated. If you are not in an area where it gets below freezing then no worries at all - just hook up, put in a pressure regulator and go! :B
Barney
