Vandalizing vehicles
Park somewhere safer, chummer.

I think there should be not only a defensive mechanism sold, but depending on what you’re doing and what area you are in, perhaps TERRA/gangers spawn to come smack you with heavy or sharp objects?

In every RPG I have ever played, it was more or less de facto accepted that you had to pay to protect your transportation. Whether it was keeping your horse in an inn / stable, parking your garage in a secure garage, or paying the locals (gangers, squatters, etc.) to watch over it.