It sounds like you have a tripped breaker.
The systems is wired as follows. Shore power to one side of the transfer switch. Generator through a circuit breaker on the generator to the other side of the transfer switch. From the transfer switch the circuit goes to a power distribution panel. It is a small version of the power panel in your house. This panel has a main and multiple smaller breakers.
It sounds like the main breaker is tripped.
I am not familiar with your coach so I can not help locate the breaker. Perhaps others will know where to look. I would look inside cabinets and pull away covers, You are looking for breakers like you have in your home. Reset the breaker and your power should be restored.
Failing that you need a meter and start tracing the wiring.
My wife and I would travel full time, but we have to sleep occasionally.
2001 Tiffin Allegro Bus 40 ft DP named the Wild Eagle
Followed by the Eaglet - A 2014 Jeep Grand Cherokee.