My .02 worth on this is if you don't have auto fill and I do, I still choose to fill my tank manually and dump at the same time. I turn the water off at the supply manually. This is not an inconvenience just the way I do it. My methods gives me peace of mind and no problems, unless I get to talking to someone around the park and I forget to turn the water off. If you didn't pick it up above, I run off the bus water pump and not the supply pressure, it can take it and I don't have to worry about over/under pressure problems should the pressure regulator go south or the park supply go dead. Just my way of doing things.
JIM