Truck Down is a company that makes trucking info available to over the road ) OTR truckers, and they sold a 'campground' database to Garmin for use in their 770 RV GPS. Some info is there, but not the campground ratings found in the Good Sam database.
Yes, I know I can access Good Sam on-line as well as other on line camp guides, and get all the info I want, if, and its a big IF when you are on the road, I can get internet. So I'm not interested in hearing about how I can use this or that plan to get better internet on the road, as I want to have the campground info OFF LINE on my Garmin GPS so I can check out a campground while not on line, which is most of the time in my case.