FerrisFamily, I also like to plan my trips in advance with both printed maps, directories, and computer software. Unfortunately, the best software I have ever found is no longer available. It was the "Campground Navigator" put out by UnderTow and Good Sam (Trailer Life.)
The last version was 2010, and I am still using it. There is a more recent product put out by UnderTow without the data from Good Sam, but that is a fatal weakness.
Anyway, I can plan my stops along the way using the 2010 version just by checking more recent campgound information. The web sites listed still work, so I can get current information that way.
I have not found anything comparable, and Trailer Life indicates no interest in putting out a similar product.
Wish I had better news, but I just wanted to say that planning at home with my desktop computer is as important, if not more important, than the onboard navigational aids. -- And I do have GPS and smart phone.