Aftermarket backup cameras/rearview mirror?

I've read a few reviews on Amazon, but figured this was a good place to ask as well. Bought an older Sequoia about a month back, and there are several little things I want to do to it now. Upgrade headlights, clean up the black plastic to get it shiny again, and add some sort of backup camera. I never really used it much on our van, mainly because the screen was rather small. But on the Highlander we have, the screen is on the touchscreen radio, and I use it a good bit to back into parking spots. The Sequoia is much larger, and with two rows of seats back there, I don't get a great view from the rearview. I was thinking of adding one of those Bluetooth mirrors and backup camera. Anyone ever done this on an older vehicle?