well that would be handy, I find that backing up with this car a bit nerve racking due to the fact I can't see much!
I was thinking maybe lower the car more in the back to make it level might help this sight problem? but lol a sonar would also help
I have it on my car. It's pretty neat, but not as great as you would think. The thing beeps, but you have to stop backing up to see where the sonar is picking up the object because the display is where the odometer is and the steering wheel is normally blocking the display. Not very useful. However, I recently installed a camera to the back of my car and ran it through my navigation-- that is far more helpful than sonar- I would recommend the camera.
I live in Quebec, Canada, the camera is usally install on the license plate and with the long winter that we have here, the camera will need to by clean most of the time and I'ts very easy to remove, no camera for me.
The back sonars works great, but it take a while to get use to it.