Hello
I have a 2017 that I leave the rear view camera on all the time, to keep an eye on the toad. I have the Pioneer radio/navigation system and just turn the rear camera on using the AV settings in the radio. One thing to realize is that the turn signal camera and rear view camera work only when the power switch on the dash is set to the coach batteries not house batteries. So you need to have the ignition switch on if you are not running the engine, as the cameras are powered from the coach battery. Also the turn signals are given priority over the rear view camera so when you use them the radio will switch to turn signal view, then briefly to the AV setting screen then to rear view camera. I hope this answers your question.
Lance
