Not sure how your system is set up.
The way our system worked in applied terms is as follows.
AC is on and running we are plugged into pole.
If we unhook from pole there is an auto transfer and the generator starts up!
While on the road, in motion and the AC is turned on, the generator would come on automatically to meet the load.
As to the technical details never ventured into that area of concern.
But from what I gather,
load served via electric cable plugged into source no generator
When power at the pole goes off, generator starts
No electric plug in while under way but power needed for a load
Generator starts up.
RUSTIC is good.
Kudos to those who make Local, State & Federal Parks & Campgrounds possible and to those picking up the slack by Providing Private Campgrounds.