Are you saying only to be careful in #1 only due to tacking (which I don't believe exists in Montana)? Or for other reasons? I think I said no one ever lived on my property until I bought it a decade ago--the people who built the house had just finished it as a weekend home and really never stayed in it except while finishing it--and the people who came through my drive came up maybe once or twice a summer or so for a few days at a time. So no one made regular use of my drive, including the people who put my drive in. Also those people improved the entire easement and their driveway, whereas before that it was apparently a really bad road.
I'll see if I can find anything on tacking in Montana, but I don't believe it exists, and if formal notice is required, it doesn't.