First alert water alarm
https://www.amazon.com/First-Alert-W...t+water&sr=8-3
Of course it only works if you are around to hear it. Had a leak at the house. After clean up i installed all stainless steel braded lines EVERYWHERE (washing machine, sinks, toilets) also installed water alarm under every sink and on the floor in front of the washing machine. Saved us a few times when the front door seal leaked. Some recommend turning off water when leaving your rig. I'm inclined to agree.