Looking around the forums and found these few:
1) Always check if someone is behind when your getting close to home and if your suss, pull over or go around the block.
2) Never display your trailer or gear outside your house, it's like a bill board for thieves.
Too many stickers can also be an attraction on your transport vehicle.
3) Never use your address to join any club, entry form, survey or license, or at a bike shop. These records are either kept on a computer or the hard copies are filed and when any of these are lost or stolen, its like a smorgasbord for criminals. They have everything they want to clean you out. Use a PO Box address or a relative or friends address that doesn't have bikes.
4) Do not use Facebook, Twitter or any website to talk about when your going on holiday or what you have and when your going out to see the local DJ etc. It just lets assholes know how much time they have when your not home. If you advertise where you are, a smart criminal will know what to say if they get questioned to cover their ass.
5) Alarm your garage, use every lock available and insure your bike. Don't leave your unlocked trailer with bikes prepacked in your garage or yard for an easy take.
6) Just because you deal with a reputable company for parts or repairs etc, don't for a minute believe that all employees are model citizens, there are turds amongst us.
7) if you know a scumbag that is involved in this, have some balls, tell the police and lets stop these bacteria from ruining others lives..
anymore too add ?