We just purchased the Garmin RV 785 as a replacement to a failed Garmin RV 770. The new one has a built in dash cam which I like. Full disclosure, the RV rides so rough that the camera video is jittery - but more than adequate to capture an event with enough detail to matter. As others have said, the Garmin RV units have specific features for RV routing (I think it's just big rig routing with tweaks, but I don't know that for sure...). This unit also has built in traffic, which is interesting but not important in my opinion. I'm a Garmin fan, so there may be other options that I wouldn't know anything about. Never considered anything except Garmin. PM me if you want more detail on the unit etc...
DAT in TX
2018 Vista LX 27N
2015 Jeep Rubicon and ATC Open Car Hauler