Two things may have happened to cause "water to come out everywhere". One, the line did freeze up and crack the pipe or two, the vacuum breaker check valve at the end of the black tank line may have broken. This check valve has caused similar problems before as it is essentially a cheap piece of thin plastic and has broken on other units.
If you do a forum search on the black tank vacuum breaker check valve you can browse through a number of posts which outline the problem and what others have done to either do away with the check valve or to replace it with a bronze/metal one.
There is a significant length of line between the exterior fill inlet and the black tank itself. The line runs through a portion of the interior of RV and is hidden behind partitions, cupboards, walls or cabinets. If the line froze it could have split anywhere well before it reaches the tank resulting in water flowing from the line into the interior of your RV and out again wherever there a hole has been drilled to allow pipes or wires to pass through.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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