Try a tractor-trailer side mirror in the car horizontally. They are around 20 inches long by 6 inches wide and have a 5/16 stud in the middle of each end.
They give a big enough field of vision that you can rotate them and
see directly behind you as well as out the right window. It's big enough that you see everything using both eyes and have great depth perception. You get the big clear picture about the car trying to get underneath you going into the right-handers. Your eyes don't have to refocus when you're looking forward and then backwards depth is always the same.
And if you mount your video camera to the right of your helmet then the split image that occurs (with the top of the screen being what's behind you and the bottom two thirds what's in front) evidence how much the car is rotating by the amount they move laterally to each other- quite interesting!