A couple thoughts:
If you are plugged into shore power and not able to charge your battery AND you have no power at the outlets then I would guess the issue is no power is even getting to your rig. Might be the pedestal, your power cable or even the connection. Check the breakers on the pedestal as well. Most pedestals also have a 15 amp normal outlet you can plug a standard extension cord into and see if it has power.
You say you are trying locate your inverter but an inverter is a device that inverts battery power (DC) to AC. Most trailers do not come with an inverter but rather a converter that allows you to turn shore power into DC power to charge your batteries and operate your house 12v system while plugged in.
An inverter normally is installed when someone wants to do the opposite and wants to be able to run their RV off grid using battery power and “invert” that DC power to AC so you can use the electrical outlets to plug things in like a hair dryer, etc. This tends to require a number of batteries, often solar panels to charge them and is also costly in most cases. I doubt you have this setup.
I suspect you are trying to locate your power converter and not inverter but again I suspect this is not the issue as I stated above.
2018 Voltage 3305