Pressure fill only
I ran into the same issue when filling the tank, and have a similar solution. I sourced a 26 gal rv tank and sureflow pump, mounted it on a plywood skid and put it in the basement empty. When we dry camp, I'll fill it up (sometimes with a 5g tank and funnel/hose) then pump the water into the main tank using a short water hose. This will bypass the pressure valve in the motorhome and fill the tank up. It takes up some room, but 26 gallons really helps out when we are not close to water.
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