dear,
1,so sorry that this unit can't work with your stock rear camera,you need to buy a new one from option.
https://www.seicane.com/seicane-wireless-rearview-camera-for-aftermarket-car-radio-116006
2,yes,the parking sensors can work in reverse.
3,it can also work with steering wheel control commands.
4.of course,all the factory settings will still work.
5,this unit can fit your car,pls place order on page.
By
Seicane