And another tidbit: there are different thermostats for turning the electric and/or gas heat on in the water heater. And if yours is set like mine from the factory the electric is set higher than the gas. This will automatically conserve your gas supply if both are turned on at once. It will also make the hot water go just a little further on electric than on gas.
And finally, because no thread should be without pictures, here is my own solution to the really inconvenient location of the electric switch on my TT. Rather than reaching into the unit from outside I converted the electric socket inside over to a socket/switch with a pilot light to indicate the on position.
2015 Rockwood 2604WS (sold as 2016)
2014 Ford F-150 Ecoboost