Speaker Wires Fixed
Well after some troubleshooting, it turned out the wires going up the arm were broken. When I got the camper, the 'snake' of wires going up the arm wasn't cable tied anymore to the arm. I suspect the wires got cut when the snake got caught somewhere when opening or closing the camper.
To fix it, I cut the wires where they go up the upper shell, replaced the wires in the snake and spliced everything back together. And yay, we now have sound in the camper!
Thanks to everyone for your comments as they helped.
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