I found my exterior shower hose reaches my gravity fill port. I take the head off, shove the hose in.
Go inside, flip the pump valves to winterizing, and pump my water into the fw tank. Works slick, I stay dry, and have a drink, while the pump does the work.
2012 Jayco X23B
2020 Ram Laramie 3500 SRW Air ride 50Gal fuel tank.
2007 Dodge Dakota Quad Cab (retired from towing)
Equal-I-zer 4-Point Sway Control