Ok. Was a pretty easy project. Posting what I found for future owners who may want to do this.
Here is a picture of the Furrion 3100 to help identify it:
It is very easy to slide out, the bottom brushed part of the face pops off by hand, and then underneath are four Phillips/square screws.
After sliding the AV receiver out, I found out the Furrion was already connected how I wanted:
Furrion DV3100 back schematic, notice the Red and White RCA connections are in the audio in.
At that point it was a matter of changing the TV connections, as on the TV the RCA audio connection was going from the input of the Furrion to the input of the TV. I simply changed the TV connection to be on the TV’s audio output and I was able to get TV sound through the trailer’s indoor and outdoor speakers. Had I known how the radio was wired, I wouldn’t have even needed to pull it out. Yours may be wired that way already as well.
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