We shut our water off before every trip, and turn the gas water heater down to its' lowest possible setting. The water shut-off is just your basic twist&turn handle.
Speaking of water
, we were at a campground last fall when a commotion ensued around a neighboring trailer that had water running out the front door. Someone shut off the water but we had to wait for the owners to return to find out what happened.
The owners' little dog had jumped up on the sink and somehow turned the water on. Bad doggie.