I prefer to travel with all tanks empty including the hot water tank. No special reason...just my preference. I guess if you pushed me for a real answer I could come up with a few.
1) Afraid of some mysterious pump/switch malfunction and arriving at my next destination with water all over the floor. Could happen right? I've read several posts where this has been the case.
2) The weight of the tank breaking the straps that hold them up due to rough roads. Could happen right? I've read several posts where this has been the case.
I figure if I get to my destination and there's no water...I'll go to Walmart and buy a 6 gallon potable water jug and haul water from some other location. I risk I'm willing to take.
Call me paranoid if you wish but I'll never arrive with a flooded camper and I'll never loose a tank out the bottom on some rough road.