all the problems have been corrected...The gfi problem and the water heater problem were unrelated...Re the GFI circuit breaker, I pulled it all the way down and then all the way up and it reset. I am guessing the excess moisture while in storage must have been the original culprit when we first brought the 5th wheel out of storage.
Re the water heater, I had forgotten that there is also an outside switch that I need to turn on to allow electric heat. This is apparently a back-up safety feature so that when you drain the water heater and have the electric heat still switched on inside, this switch (if switched to the off position) overrides the inside panel switch. It is located right by the drain plug