here is a thought along badgers line of thought. Typically, if someone is smart enough to do what he says, they would have been smart enough to prepare to begin with. Bad Guys in general are not intelligent ( this isnt the movies and Heinz Gruber's dont really exist ). The probability that the one intelligent, trained, equipped guy with bad intentions, stumbles across the 1 of 1,000 dirt roads and randomly decides it is different than all the others and has a ft knox of supplies at the other end is astronomical. You might as well believe that aliens may take you out of your bunker through your toilet vent pipe.
Additionally, in rural areas, the oddball dirt roads are the ones without gates and cattle guards. So a locked gate draws zero attention.
Although I do agree about booby trapping...if you booby trap, they trip it and survive, they know something is up. So make sure your traps are lethal, and those you care about know to avoid them.