Fresh water system

This is almost certainly a dumb question, but doesn’t pulling a full, 90-gallon water tank use up 22% of your cargo capacity?
 
Hey that was my suggestion to hubby, and he laughed at me and said nope won't work that way, so where will it overflow to so I can educate him.:facepalm:

Usually a small vent hole near or around the fill port.
It squirts back at you when it’s full.

Just put the hose in the filler spout and run it till you see the water coming out.
I use an inline flow meter do I know how much water I put in.
They’re cheap on Amazon.
 

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