In my 2010 sunset trail, I also found my surround wiring at the back of the shelf under the tv mount where the standalone receiver would be, In a large flex loom jacket. I replaced the original receiver with a double din touchscreen unit for bluetooth streaming, and such.
I would assume that in most units, the wires would be easily accessible if you know the original location of the factory installed stereo.
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2010 sunset trail ST26RK, 2012 Nissan Titan SV crew cab, equalizer hitch / Pine Grove, Pa
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