I have a few trail cameras on my property and they work pretty good, but not always. From what I've seen on Facebook and other sites, trail cameras usually get stolen from the criminal since they are so hard to hide, and also have in a position to get a good picture.
On this property, there are a few large oak trees, a few buildings, and a lot of open area. I do not think that a game camera will accomplish anything.
I like the idea of making the tractor harder to start. I really like the loose wires idea!!! Make it look broke down. I agree that a chain is too easy to cut off to be of much use.
I'm looking at the different tracking devises suggested. In my opinion, I have two thief issues. The local kids who take it for fun, or the pro who takes it to sell somewhere out of the area. In both cases, I believe my only chance of getting it back will be with some sort of tracking devise. Fortunately, it's an older, 2wd, open station tractor that isn't as desirable as some newer, better equipped tractors. But it's also a 2012 without any smog on it, so there's some demand for that.