text: This sounds like a terrible idea.  These drifters will take advantage of you.  They will spread the word and they will converge on your Barn like Bees to Honey.  These type of people smoke, throw their buts on the ground and maybe burn down your Barn.  You would do better to put up a big sign - BEWARE OF THE DOGS - NO TRESPASSING.  And get a couple of outside Guard Dogs.