I installed a factory kit today. The Mopar kit included the camera (tail gate handle) and all the wiring necessary. It took me about 3 hours, but I had access to a lift. I believe the next would take less, than 2 hrs.
There is a harness that needs to be installed along the left frame rail, hook up a red wire to the TIPM, a black to ground than the rest goes into the cabin, a purple wire to the BCM, the rest to the radio. The centre stack (screen) has to come out, but it's no big deal. The word thing was to install the purple cable to the BCM, there is barely any room to do this.
Make sure to set up an appointment with your local dealer to reconfigure the vehicle - the sales code has to be entered to get the system working.
NOTE! after the installation the screen goes blank and you won't be able to control NAV, radio, HVAC… until the reconfiguration is done. Some shops has been booked for weeks…
The installation instruction which came with the kit is very good.
My next project is the factory integrated trailer brake control.