I hardwired a 12V RV water pump in the pass through, which is next to the fresh water inlet. Inlet of the water pump has a SS dip tube and plastic tubing, outlet is a water line to the fresh water tank inlet. I fill a 7 gallon water jug at the campsite water and back at the trailer put the dip tube in the water jug vent and turn on the pass through pump. Repeat as necessary. 7 gallons is easy enough for me to carry around as needed and gives a decent amount of water. One trip is usually good for a days water, occasionally a second trip is needed.
Sure solves the biggest problem for me, lifting the water jug high enough and long enough to dump it into the tank through a funnel.
