Post one sign: Trespassers will be shot, Survivors will be shot AGAIN!
Make sure the first shot kills them and the ACLU SCHMUCKS can't say anything.
It also helps to have the "Keep Honkin' I'm Reloadin' " sticker on your truck as well.
Better to be tried by twelve than carried by six!
BTW, that's what I like about Arizona. You can go just about anywhere strapped and it's legal.