The original poster hasnt updated us in a while, the problem must be over. My suggestion is as everyone else's. Alert your local LE, get a dog, train your wife on a strategic plan and the ins and outs of handgun tactics. Also, someone else mentioned taking a picture, if possible, have your wife take a picture of the person and his vehicle. This is not being paranoid, everything I listed is all within sanity. I hope everything has turned out well.