Is this a Motorhome?
Are these valves at the hot water tank?
A picture is worth a lot. Try to post a picture and you might get some feedback.
Most motorhomes do not require your input when using hooked up water, other than to turn the pump off.
"LOVE and LOSS, are two of the greatest emotions one can experience. -- I went to school to learn about "WHAT GOES UP MUST COME DOWN" but I had to live my life to learn the lesson of: 'WITH LOVE THERE WILL BE SORROW'."
David Stewart. (after loosing my NAVIGATOR)