There are a few different types of anti-theft devices that can be used for trucks. Some of the most popular include GPS tracking devices, alarm systems, and immobilizers. GPS tracking devices can help you track your truck's location if it is stolen, while alarm systems can deter thieves from even attempting to steal your vehicle. Immobilizers prevent thieves from being able to drive your truck even if they do manage to steal it. Choosing the best anti-theft device for your truck depends on your budget and the level of security you need.