Alabama Jim wrote:
The fresh water tank is only needed if you boondock or stay in a Walmart Lot, etc.
Also handy if doing a quick stop for lunch. It allows you to wash your hands and use the bathroom.
As someone else said, what happens when the park water goes out? We've had several parks where water was shut down for a few hours for work on the system. A failure could be days.
Also as someone suggested, if your plumbing springs a leak (city water is usually at higher pressure so more likely to fail), it will keep pumping water into your RV until you realize what is happening. If you use the pump and there is a small leak, you will hear the pump kick on periodically when no one is using water and it will let you know something is wrong sooner.
Finally, resale is going to take a big hit as I'm going to assume the worst when an RV is missing key systems.