I used a Spot Gen 3 for a few years when it 1st. came out on my motorcycle until I had to give up riding.
They have another device called Spot Trace which is designed to track vehicles or any equipment that is mobile. It will notify you immediately when your MH is moved, even just a few feet. I would carry my gen 3 on me in case of an accident where I could press a button if I am capable requesting help IMMEDIATELY. When I was not riding I would put it in my saddlebag and just by someone standing my bike upright it would trip the alarm and notify me.
https://www.findmespot.com/en/index.php?cid=128
It runs on batteries with an optional DC power backup. It is $99.00 and yearly service at $150.00
It can be very easily hidden and it will track them ANYWHERE in the US or Canada EVEN DEATH VALLEY as it works off Satellites, not cell phones.
Hope this helps.