I have posted before on this subject. There are several very good alarm/security systems for trailers available on the market. The systems will range from $500 to $1500. While this seems like a lot, what are you out if a scumbag heists your trailer, car, and all your stuff?
Many of the systems not only sound an alarm but actually apply the trailer brakes if someone tries to make off with the entire trailer.
Just do a web search for trailer alarms and you can see what I am talking about.
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