another way of saying the same thing: u don't want the hw heater to run while ur on the move. on mine, there is a switch on the inside of the trailer for the gas side of the hw heater. if this is off, it won't try and light when the water temp drops.
i run mine on electric only and shut the breaker off when i leave the campground (my habit). i don't want to inadvertently leave the switch on for the hw heater and plug the trailer in for long periods w/o water (between trips).
it's easier for me to check the breaker