[artfuldodger]

I.ve filled via the winterize port many times but on our 2017 it is no longer possible according to the sticker inside the water centre. I also can no longer gravity fill through the vent hole at the back because the water backs up and will not let the tank vent. It then burps and blows water out. If you feed the water in very slowly it will fill but it will take a very long time to fill an empty tank.