Have had a 760 for a couple of years now, and have only experienced two misdirects: one was way off (several blocks) and the other was just the wrong side of the street. Otherwise, it's been pretty accurate over several trips and several thousand miles. Also own two other Garmin GPSs as well as a Garmin Dash Cam. All have worked well.
For a rear camera, recommend Rear View; have one on the cab of my truck and one on the back of the Cyclone, both hard wired. The system allows for a total of three cameras. There is a separate screen you'll need to make provisions for, but I find it handy to not have backup displays on the GPS.