Here is complete different view on the solution.
there is a GFI outlet in my 990 right next to the kitchen sink.
This GFI has one AC line going down to AC circuit breaker (marked line side on GFI) and one AC line going to the rest of the outlets (marked load side).
I pulled the LINE side out of AC circuit breaker panel and ran it to the Center pair of terminals on a DPDT switch (double pole, double throw).
I wired one side of the DPDT switch to the AC circuit panel breaker.
I wired the other side of the DPDT switch to an AC plug that plugs into my 800w power inverter.
This switch is labeled Shore Power on one side and Inverter power on other side.
I mounted inverter on top of battery box, under sink and plugged in cable that goes to my outlet from step above.
(note, the way the switch is wired, this AC plug going to inverter will never be hot if its unplugged from inverter).
1)switch DPDT switch to Shore Power side.
2)turn on inverter
Now your inverter powers all the outlets inside the RV.
I have a power strip inside cabinet, with end fished through grommet to outlet for TV.
If you want to run this outlet chain on Shore power (or generator) just throw the switch the other direction (I have actually switched live and Satellite system does not reboot from lost of power).
This also gives you the ability to plug things into other outlets in RV to charge batteries when running on inverter.
on my 2016 990, I am 90% sure the outlet for the AC charger and Refrigerator are NOT on this GFI load outlet and have there own breaker. Same with Microwave, its on its own breaker was well. Its been a long winter and its still covered so I can't go check).
