If you can't stop them stealing your gear, there are tracking systems that are getting cheaper by the day.
To be effective, I would think they would have to be well monitored.
Worked to perfection here recently when a landscaping business grew tired of losing large specialist mowers, so installed one of these systems.
Owner was alerted as soon as the thieves loaded a mower onto a trailer, and notified police.
Cops were able to intercept the thieves with a road block, which they tried to crash through.
A few shots through the windscreen quickly settled the matter.
After a lengthy stay in hospital the driver eventually had his day in court.
Cheers, Greg
http://www.news-mail.com.au/news/reports-man-shot-head-police-outer-brisbane/2426190/