If your black or gray tanks over fill they should back up in the RV. If fresh water over flow it should have a vent to allow it to escape without harming the RV.
Sounds like you might have a leak in one of your pipes when it gets to a certain level. Maybe a joint has separated. Needs to be found and dried out ASAP.
Good luck.
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Doug & Melba
2014 GMC dmax, crew, dually
2015 DRV Tradition
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