I walk past the rear of car every day and giving the camera a swipe with my finger as I pass (not perfect, but good enough to use then) is as much a ritual of exiting the car as unbuckling the seat belt, pushing up and in the steering wheel, and plugging the car in. Think about doing it for two weeks, and it becomes a lifelong habit.https://www.amazon.com/Camecho-Wireless-Waterproof-Assistance-Trailers/dp/B00M979UL2
I installed this on my 2010 Silverado 6.0L. It is base commercial fleet, with a topper w/o any rear visibility. Works well! 2010 was the year before the regulated backup cams.
As for the Volt, I find I never use my backup cam because its always covered in mud/dirt. I liked this setup (the Silverado) because its wifi, so I can move it about(To the trailer, or to terrible in-law driver when visiting me). To each his own. good luck OP!