When not carrying a trailer, the 2 key or -> in the D pad lets you switch the side of the camera which is VERY useful, but for some reason when you carry a trailer this button stops working for that and instead focus the camera on the trailer.
My suggestion is to make 2 and -> switch the camera side even when carrying a trailer BUT use the 3 key and down arrow in the D pad to switch to the trailer camera.
Currently the Down button is used to go to advanced mode which is also used by the up button. We can save that redundancy and use the buttons for something useful.