My first trailer was stolen from a storage yard, I never saw it again so I decided my next one will have GPS tracking. I did a bunch of research and decided to try this:
I made the right choice. The initial price is higher than some but the very reasonable monthly fees more than make up for it. The best part is that it only transmits in timed bursts, so the detectors some crooks use likely won't work. That also means the rechargeable battery lasts longer.
Here's my initial thread with more info:
Well over a year after I bought it I'm still very happy. Fortunately I haven't actually needed the tracker, but I like knowing it's there.