I think Autotech hit the high points. Your question was well worded, too, when you said <font color="blue"> "to help prevent theft" </font color>. That's about all you can really do. If someone decides they really want YOURS, there's not much you can do.

Lest there be any misunderstandings here, let me say that while I'm speaking from experience here, it's not as a professional thief (at least not in the conventional sense). I've done a lot of repossessions over the years and encountered a lot of different types of efforts to prevent me from accomplishing my task. I've never failed to get one I wanted so long as I could find it.

Personally, I use a coupler lock on my trailers and I park them out of sight of passers-by so as not to stimulate someone's desire to have what I have. Again, I know if someone decides they want mine and know where it is, there's not much I can do about it.

I'm not happy about this, but it's a fact of life.