What is the best car alarm out available to install on a 2009 Chevrolet Express?

We have a 2009 Chevrolet Express, a rather large van. I was wondering what the best choice for alarm systems would be. Ive looked a few up, but am unsure how that would connect into the car's existing electrical systems and how secure it would be for a vehicle that is larger than most cars that is is designed for.
What is the best car alarm out available to install on a 2009 Chevrolet Express?
LOJACK is the best
What is the best car alarm out available to install on a 2009 Chevrolet Express?
Size doesnt matter, they all sense when a door is opened or when a shock is sensed (window smash). Just make sure you have a good installer. For an automatic alarm, one that senses the remote, you should check the range of sensors (I know Simple http://simplecaralarm.com has no problems with this)..

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