With a big ranch, access often is not a problem. Even if the road cuts through the ranch house area, I've encountered many friendly ranchers who grant passage, asking only that you leave gates the way you find them and perhaps sign in. To me that's western civility and good multiple use policys in action. I curse the bastards who abuse that policy by damaging roads, stealing ranch equipment or shooting holes in water tanks. Be it for legal reasons or out of sheer good-naturedness, many don't.
Access becomes more difficult when a ranch gets subdivided.
When someone buys a chunk of land backing up to a National Forest, that shouldn't grant him exclusive use of public land as his personal backyard. But sometimes the issue can be very gray. A case in point is the Chalauleau Gap area. A horde of signs with tenuous legal weight shoo people away. The signs stem from landowners fed up with motorcross and ATV users charging up and down the road at all hours of the night at break-neck speed.