I have the Garmin RV760 and its a great unit. I prefer to have a dedicated unit, front and center on my dashboard, that doesn't need a data plan and cell connection to operate. It also functions as a Bluetooth handsfree device and, if you let it, the unit will also connect to the internet through the Smartphone Link app to enable additional features.
I bought it with the BC-20 back-up camera and mounted that in the Furrion mount. I have a thread from about 2 years back about how I did that.
Following a trip to Florida, I had decided that I had to add the extension cable to move the transmitter from all the way at the back into the front storage of the 5er because the signal was intermittent. It was really annoying that every time the camera signal became strong enough to be received, it captured the screen and I had to hit the 'return' button to get back to the map. Each time the signal became too weak for too long and then came back up, that cycle would repeat. That was usually just after dusk, after a long days drive, when navigating local roads to an overnight campground in a city you'd never been to - just when you want the map screen on full time. There is no setting to disable that auto-switch behavior. No more problems now that the transmitter is just over the right taillight of my TV.
The camera is quite useful on the highway... just flick the headlight switch to 'running lights' to immediately see what's behind you and turn off to return to the map. Lots better than trying to judge lane change merging in your side-view mirrors.
If you have multiple Garmin -LM units (I have 3) its best to download the map update for the RV760 first because, while its the biggest, once the Garmin Express app unpacks it, the other 2 map updates don't have to download very much more.
When I sold a SOB GPS (a completely underwhelming Magellan), I just gave the person my site login so they retained the lifetime map updates.
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam