Even the Garmin RV specific models have a database about as useless as teets on a Bull.
I had an RV760LMT take me to a bridge that was washed out in Vermont during Irene in 2011, which will never be rebuilt, while it was taking me to a COE campground in 2014. Then it rerouted me to the COE dam at the place instead of the campground which was over 7 miles away to a locked gate, requiring about a half mile of backing up to turn around.
There is a popular Campground / resort near our home. Garmin shows it 8 miles from where it is actually at, on a completely different road.
Both of the above discrepancies have been reported to Garmin back in 2014, and as of the most recent update are yet to be corrected.
Once you get off the main roads and Interstates here in PA, you also get a lot of "RV accessibility unknown" messages when you have it in RV mode based on length etc. I sure do not know what good it is or why I spent money on it.
I'll sell it cheap, send me PM. I also have the rear camera made for it.