Homemade manual transfer switches, and electrical monitoring system.
The left switch switches the input from either the inverter or generator, and feeds to a the lower position of the switch on the right that switches between shore power and what is selected on the left switch.
The displays are;
As pictured the air conditioner is running on generator as is the rest of the trailer except my refrigerator, it is running on inverter via the third switch on the back of my transfer switch. (Not in picture).