I am looking at doing the same thing and it does look like both those harnesses are required. It’sI have a bose Nav system in 2013 Yukon Denali XL. I'm planning to replace with Pioneer 8400NEX using Maestro RR. Does any one know if I need to HRN-RR-GM2 work or HRN-RR-GM5. Also for rear seat entertainment, I'm planning to add HRN-AV-GM5. Do I need anything else? Thanks in advance
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pretty expensive