Also tried Delorme a and found it lacking. As to the campgrounds not being up-to-date, I download from POI Factory the listing of campgrounds in the US and import them to my copy of S&T.
Still the best planning tool but I then use the GPS and local iphone apps for immediate navigation.
I figure the main roads will not change and if I'm going to a specific area I use Google Earth to see exactly what is there and even how narrow the sites are in a campground. I've also double checked to see if a site is long enough to stop and not unhook.
I'll keep watching to see who finds the next best item like S&T.