I have just purchased and activated the SPOT Trace
which provides theft-alert and tracking if the trailer is moved. I got mine from WM for CA$ 118 and I will receive a rebate of 50%
with mail in form. There is a yearly fee for US$99.
It needs a clear view of the sky so I am thinking of putting it on the dome for the Fantastic Fan. The AAA lithium batteries will last for up to 24 months, but if the trailer is moved the tracking function is triggered by the movement and the unit will send tracking information every 5 minutes for between 9 and 24 days
. You could also hook it up to a 5V source (micro USB) that is connected to the trailer battery for longer tracking times.
I have tested it and even a small movement will send an alert to my phone (via email or SMS.)