Just got an 09 Laramie. I ordered the video system as an accessory with the dual headrest lcd screens instead of the factory installed headliner mount. This comes with the remote and headsets. Will SAT TV be enabled through my existing media (mine has the NAV) or will I need something extra added on or exchanged such as software? Also, has anyone tried the WiFi? How is that hooked up and what does it cost? Thanks.