What is your best or favorite "trunk gun" and why ? I am relating this towards the handgun platform. I used to keep a Glock 21 for mine but I am changing it out. I am on the edge of picking a S.A. XD9 fullsize , Ruger P-Series 9mm , or a S&W Airweght 38 revolver . I cant decide which , but what is your favorite gun to use as a last resort in your trunk or even as a "goto gun" ? Something that you would not put a lot of value on BUT that is reliable . RELIABLE is the key word.