I want to tie the inverter in to power all the breakers in the utility panel, not just the breaker that feeds the TV. That's why I'd trip all the extra breakers that are not needed.
The way my camper is set up there's no way I can hide an extension cord. The TV is in a wall mounted cabinet. On the other side of the wall is the bathroom, and the utility panel/inverter is past that bathroom. IF I plugged a cord in, the cabinet door wouldn't latch closed, and it would cross the path of 2 doors. People would trip over it going to the bathroom. And then it would only feed the TV. I want to power a receptacle for a circulation fan also.
In the picture, a 12/2 comes in on the bottom right corner feeding the terminal strips. That's where I "think" I can tie this in. I'll be the only one operating all of this, so I believe I can get by without a disconnect switch, or just unplug it and turn off the inverter when not in use.