Alarm for a GMC Sierra?

I have a 2007 GMC Sierra. It has no electric locks or windows, basic model. I have looking for an alarm system to prevent, or deter someone from trying to get into my truck while it is parked in my driveway. A lot of the systems I have been seeing seem as though they would only be beneficial for automobiles with electric locks/ windows. Am I wrong, or is there a system that would help me out in protecting my car. Our home was recently broken into and we are trying to secure our house and automobiles. Thanks for your help.