Consider adding your own gravity water fill port. Here are a page of possibilities:
https://www.amazon.com/s?k=rv+fresh+..._ts-doa-p_2_27
How easy to install will depend on your MHs geometry. The fill port has to be located so water can flow downhill to the fresh water tank. Sometimes beds and appliances get in the way.
But if you can easily add one, a gravity fill port may be your best option, or maybe not. I have to lift a 5 gallon water jug up 5' to pour into my gravity fill port. A 12V transfer pump would sure be easier whether I use the gravity fill port or the shore supplied water connector.
David