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!