Of course this is the other stuff I would highly recommend:
Sound Deadener Showdown - Your Source for Sound Deadening Products and Information
Sadly, one of the common misnomers spread forth by shows like Overhaulin', Pimp My Ride, Unique Whips, and a few others combined with car audio dedicated forums is that EVERY square inch of sheet metal must be covered with deadener. They also spread the lie that deadener can be used to kill outside noise. Sadly, one only needs 25% coverage of most offending panels to lower their resonance frequency (i.e. the deaden part) and there are far more effective solutions to kill noise, like mass loaded vinyl and closed cell foam.
Can deadener reduce road noise? Sure it can if you use enough of it. You can also use nuclear warheads to kill flies. My point? Use the right material for the job versus purchasing 640 square feet of deadening and covering every square inch of your vehicle multiple times to kill noise. Here is the perfect example of what NOT to do:
2009 Corolla S SQL Build log - DIY Mobile Audio That guy totally overused mat deadening combined with liquid deadening to reduce his road noise and added 200 pounds to his car in the process.
In the OP's case, I recommend he find the offending vibrating panels, add some sound deadening and possibly use some foam, like from egg crate mattresses, stuffed between the two offending panels causing the vibration. Other methods would be to use that foam in a can. Just be extremely careful if you use the expanding foam because it can cause your sheet metal to buckle if you don't keep a watchful eye on what you are doing.
ETA: I forgot to recommend an alarm. I would recommend Autopage or Clifford, even though I don't like DEI all that much. As for sensors, I highly recommend a tilt sensor if you have nice rims and an infrasonic sensor that detects drops in cabin pressure along with a battery backup.
how to fix rattling and need a nice alarm 
