In the early posts on this thread it wasn't clear to me that two campers are currently missing. It may be that theft is more of a problem than it originally appeared to be.
The service for the Spot Tracker is a bit cheaper than the service for a Spot Gen 3, if a 5 minute tracking interval is good enough for your needs. That is $99/yr or $12/mo. You would have to check with them to see how easy it is to start and stop service, and whether there is a penalty for less than a full year service.
http://www.findmespot.com/en/index.php?cid=129
If you opt for a 3 minute interval, then it is the same cost as the 3 min interval Gen 3 service, a total of $200/yr.
The Trace is a bit cheaper than the Gen 3. I haven't seen where they offer 100% rebates for them like they do the Gen 3.
These devices can be powered either by batteries or 5v USB. They can gobble up batteries pretty fast, which why we used rechargeable NiMH batteries on ours. I have no idea how fast they might deplete the Camp-Inn's onboard battery (which would be dependent upon which battery you have). But if you were interested in running off the battery, this 12v to 5v mini USB could likely tie into the terminal on the back on the 12v cigarette lighter plug that is accessed at the back of the curbside galley cabinet:
http://www.amazon.com/HitCar-Inver...&qid=1457636347&sr=8-5&keywords=12v+to+5v+usb
By drilling a hole in the lower left corner of the curbside cabin cabinet (directly above the 12v outlet) you can install this anywhere inside the cabin cabinets that the available cord can reach (hopefully where the thieves won't find it until it is too late for them).
There are similar converters with a standard female USB connector, in case you want the ability to use the power source with something other than just the Tracker.