My 2021 312 BHTS travel trailer has a nice sound system. But I can’t figure out how to get the TV audio to go to the system. Just getting audio from the TV speakers. I would appreciate some help with this. On the back of the TV, the only connections are the hdmi and the cable. No audio out cable whatsoever. So. I’m wondering if it is even wired for audio to the sound system. Do I need to move the hdmi cable to the port with ARC? Thanks for the help.