RV'ing couple missing

Here in NV lots of dirt roads have designations as highways or County road. Some of these roads are passable in passenger cars, most are rough in a 4X4. Unfortunately the GPS / "maps" people are not aware of this, so they treat them are passable roads. Several years ago an elderly couple traveling from Idaho during the winter followed their GPS, got stuck with the same results as this unfortunate couple.
In short, if you haven't traveled much out West, please do not venture off a paved road based on your GPS or other "map" program. Chances are whoever created the route has never been out here and is unaware of the dangers.