I don't know why I didn't think of this before, but what you really need is a trunk monkey. These things are sweet. 

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When i was in school we had some kids break into somebodys truck and steal the radio, then they loosened all the lug nuts on one tire (It came off at 35mph and destroyed the bedside since it was a fibreglass stepside.) Then they had the balls to install the radio in their car in the school parking lot the next day. I wish we could still hang thieves.
We had to get signed off on using the headlight alignment thingy for class-I just use a wall... But yeah. I checked into Vipers on line, about $450/truck is a bit steep for me, I'll have to check Amazon though.Learning to use the machine is a step toward getting licensed to do state inspections. That is big money here in Md. I don't know about where you're at. I'm all for just using the wall though, so long as I don't have a state trooper looking over my shoulder. I hate most aftermarket alarms. That said, if I was to buy one I have heard good things about Viper. Customer service is said to be good, and the alarm itself is reputed to work well. The tilt sensors, while potentially effective are nothing but a pain if you ask me.
whats an alarm going to do? even if you have a 2way pager alarm do you think it would it work in your shop building, in the mall, in the movie theater? the harder you make something to steal the more direct approach thieves are going to take to get in. up the drastic-ness in security and thieves will up the drastic-ness to get in. this is why honda pros flatbed hondas, why learn to pick the locks, deal with lojack, disable the alarm back up battery, find the dual fuel cut off switches, find the electric cut off switch, when they can just tow the whole car away to the chop shop in 10 seconds or less. if they want your sh!t they will have it, sad truth.
move out of the ghetto and choose your friends more wisely.