I would mix a lot of different types of sensors together if I needed a reliable system. There's also the option of using sensors which detect loud noises and kinetic shock to the car frame (like seismic sensors, but not seismic sensors). Ask for more detail on Electrical Engineering / Arduino stackexchange if you need a controller for your builtin siren. I've used HC-SR05, but I recommend something less sensitive, it can pick up movement from 5-7 metres. The 3V3 signal lasts about a second, and the PIR will auto-reset. If you can't find an alarm system that is tripped by 3V3, it's easy to amplify to 5-12V with a transistor. Just pull a wire from 12V to a voltage regulator (7805 is very cheap and reliable). When triggered by motion, they shoot a 3V3 signal out, which can be used to trip an alarm. They consume current in the microamp-milliamp range (5V) when active, so it won't run down your battery. You can get extremely cheap and low-power motion sensors (PIR type).
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