Dave
My RP box is in a cabinet above dash next to entry door. First set of Multi wires go thru side of cabinet down passenger side of post for windshield into dash and radio. Second and third set go thru same side but go into radius part of roof and one set out cabinet above passenger to Home Theatre which we don’t use as dvd player in it shows dvd’s with green tint. The third set must (I assume) go into ceiling and off to all speakers. My radio/theatre switch is in cabinet above entry door. My tv is in passenger side kitchen slide and I have video cables that run from tv down thru lower kitchen cabinets out to below fridge into wall up to roof radius out wall into cabinet above passenger where home theater, DVD player and cable box are. And of course not having xray vision, its guess work.
Good luck!!