A back-up or rear view camera is a must have and in 2018 they will be required in all new cars sold in the U.S. Many manufacturers and moving faster than this. If you have one of these, you understand why.
These relatively cheap devices quite simply allow you to have eyes in the back of your head when putting a car into reverse. No more running over items (or heaven forbid people) hiding below your line of sight behind you. No more getting just a little too close to the car behind you while parking.
The good news is that they a relatively easy to add to an existing vehicle. The camera itself is simple, but you will need a display. You can choose a dash mount or to to replace the rear view mirror with one that will cleverly show the rear view inside the new mirror itself. You could also go all out and replace your current entertainment system.
Have no doubt, you will love the addition!