Sounds like a good idea, While you are at it you might want to add a second switch to your electric heating element in the two way water heater if you have it.
That's the one I forgot to turn off, then didn't plug into electricity again until the trailer was winterized and no water in the water heater tank.
It didn't ruin anything, the breaker tripped, and heating element still works but it would be really good to have an illuminated internal switch for this just like the gas water heater switch and water pump switch.