to plug in or not to plug in when mhome is at home

You would not , once plugged in, turn house battery switch on for any reason would you? In fact you would not flip that switch to on unless you were not plugged in but how about with the generator on? I always flip that switch to on when I decide to drive is that correct? They say just drivingn charges both batteries( I think) so would it be necessary or advisable to switch the house power to on when driving? Doug