Does anyone know what it would cost to get the factory Nav unit installed with the back-up camera? I have an 08 H2, with the standard XM radio CD/MP3 deck now, and I do have the On Star GPS antenna, so I would think it would just be a plug and play option. The rear bumper has the hole where the camera goes, so I would imagine they would just have to run the wiring to the camera and mount it. I'm thinking I might be better off just going with an after market system, has anyone looked into this?