I have the Kenwood 5120 with nav and bluetooth (installed by dealer before I got the car). Just got the xm sat radio interface and universal rear view camera accessories for it. Anyone else add these items? I need some insight on where to put the camera and antenna, how to run the wires. Would love to do it myself to save $$, but I've never done anything like that and am kind of afraid of pulling apart panels or something in order to run the wires. Any suggestions (and pics!) are welcome.