I have not examined my fill tube that closely as we always have city water hook up. If you can't get to the area that may need tightening, I'd recommend an appointment with your service department. Tell them there is water leaking, that may get you in sooner... maybe.
Our 2018 has had a few loose fittings that I've had to tighten. The water inlet on the toilet, shower drain piping, outside kitchen sink, and the water line on the inside kitchen sink.
It seems that if you're not working on it, you're not getting it out enough. lol
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TT- 2018 Jayco WhiteHawk 27RB
TV- 2009 RAM SLT BigHorn 1500, 5.7 Hemi, 3.92 gear, 4x4
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