I've got a 2006 Sequioia with Navaigation and Rear Enertainment/DVD. Wanting to upgrade the factory radio with a unit that has DVD, Navigation, Blue Tooth, USB and rear camera. Under no circumstances can I loose the functionality of the rear entertainment, I want to maintian the duel zone operation. I've looked at after market systems (JVC, Kenwood, Pioneer), but I'll loose the rear entertainment system. I see some of these models from China they say it works with factory harness, none specifically say it will work wih rear entertainment. Any suggestions?? Has anyone with a the full entertainment package upgraded?

Any help will be appreciated!!