It all really depends on what you're looking to do to the AV equipment. Are you changing locations or just changing what's there? If you just want to swap the stuff out, then good chance you can reuse the existing wiring.
I've run a couple new wires, like adding an HDMI hookup for plugging in the iPad, but in my trailer, I was just dropping down a hollow wall so it was pretty easy once I opened it up.
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