Your best solution is a second camera, which is what I have. I agree that lowering the camera will help.
If you have enough cable, try taping the camera in different locations (heights) until you get the view you want. Several pieces of masking tape will hold it for a few minutes. This is what I did when installing side cameras.
Unfortunately, as you mount it lower you may lose the view of the tow bar. Being able to see the tow bar is helpful when hooking up the tow car.
Fred
Fred & Vicki
St. Augustine, Florida