Sounds like your 12V system is down. That would suggest the power converter is not functioning. Try plugging into the truck and running it for a little while to charge the battery. Also check the mini circuit breakers near the battery. The one between the battery and power converter may be tripped. The
12V Block Diagram and Diagnostic Guide has explanations and pictures.
Have you also lost power to 110V outlets? If no 110V is getting through from either shore power or on-board generator, you may have a problem with the transfer switch.
If you have a voltmeter, take some readings.
Outlets (bedroom and living room): 3 readings - voltage between hot and neutral, between hot and ground, between neutral and ground.
Voltage across battery terminals while plugged into shore power. Should be over 13V DC (while not plugged into truck).