Car Alarms: truck alarm, chevy silverado, sugestions

Question
i drive  a chevy silverado and unfortunately i had my tools stolen from my truck from my drive way .i need an alarm that can protect the contents under the canopy.any sugestions are welcomed.thanks

Answer
A decent 2 way paging alarm with good range and
a 2 stage microwave (mass disturbance) sensor in
the bed to detect movement. That combination should
give you a slight edge on the crooks.

Have a look at www.PAGINGALARM.com for my ideas
on which system.

ALARMTEK