Do a search on here as this has been discussed before. Yes you should be able to use your winterizing hose inlet and your built in 12 v water pump. You should be able to suck in water from what ever container you have and add to your water tank. I am sure I read a nice write up on this on this forum where the guy went into very good detail of exactly how to add water to the tank. I tried the removing the vent cover at the rear of the trailer. Decided that was not going to work to good for me. Good luck.
Tom Marty
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