My rv hookup was found to be miswired. Several appliances residing in my 2005 JayFlight 27BH fried as a result. Start with the low hanging fruit! What is the advice of the forum in selecting the next solution for trailer sound? The several built in audio speakers are still serviceable.
Depends on quality of sound and what is good enough for you. I'd go with a smart TV and a nice bluetooth speaker. Stream music through TV. Move speaker where you want, inside outside, where ever. Ditch all the wires.