The major complaint about the Axxera AV614BH is them inability to simultaneously display the backup camera on the screen and listen to the radio.
There is a solution. However, any modification you make to your RV may have an effect on your warranty.
What is needed is a switched 12v source, an on/off switch and a connection to the "Reverse" lead on the Axxera AV614BH.
I picked a lead at the camera control box that is turned on with the ignition:
This box is where you would make changes to the camera configuration.
Here is the wire that I tapped
And here is the "Reverse" wire on the AV614BH
This is what the area behind the center console looks like:
And finally here is a video of it working