How do you protect your A/V unit?

[dkhl]

This is probably a dumb question. But I was recently thinking about buying a DVD screen car deck things and I was wondering how people protect them. I know you can just pop off the faceplate off a regular cd deck, but what does one do to protect the expensive a/v unit?

 

[TrueBlue95GT]

Well with most that I've seen, the screen folds into the actual deck, so in order to steal it, you would have to rip out the hole deck. The decks that you remove the faceplate are the same way. I guess you could chain it to that big 3 inch bar behind our dashes?