The 2004 and 2005 Endura coaches do not appear to have AC supply voltage invertors or generators as stock equipment,but a 'generator prep' is discussed. This implies that there is at least a transfer switch or provision for one.
To avoid any confusion, there is always a "converter" in these RVs that provides 12 volts to interior lighting when connected to shore power -- since this is essentially a battery charger/conditioner there is no need for any transfer switch on the low voltage side of this component.
This link may help you visualize how your coach is equipped:
https://www.google.com/url?sa=t&rct=...RBVq1EmIrXXVKz
Chuck