Some people act like sliding windows don't lock, geez. It wouldn't be that easy to get into. Mine is very secure, I don't know how you would be able to unlock it without breaking the glass. If someone wants to break into a truck, it won't matter about the back window, they would just pick the one that has the best stereo. Get an alarm if you're that paranoid.
That being said, living in FL with no AC, I love my sliding back window, though it gets noisy with dual Flowmaster 40s under the bed.
