I installed myself a new head unit and a $9 hard-wired backup camera from Amazon on my Jeep. Works great and looks good - except in bright sun with the top down. In those situations the screen gets washed out by sunlight.
In our high roof Sprinter, we asked SMB Texas to replace the factory backup camera with a wider angle camera. They misunderstood and installed a wide angle camera IN ADDITION TO our factory look-down camera. And boy are we glad they did! We can now switch between the look-down view (so we don’t run over anything when backing up) and the new view, which is like a totally unobstructed rear view mirror. In fact we often leave the new view on as a rear view mirror while traveling.