For me, basic theft prevention is having master disconnects on them and never leaving the keys in them unattended unless they are sitting right here in the side yard and that applies to all the vehicles, not just the tractors
Vandals will be vandals no matter where you are though my view is vandalism is higher in more populated areas. I practice due dilligence and have everything insured for ACV.
Have to say I've never had that experience, nor do I want to experience it.
Out here, people in general respect other's property, both real and personal.
Far as Hay Dudette's comments about master disconnects on my Kubota's, I didn't add them with teft protection in mind at all. I added them to take the flooded cell starting batteries out of curcuit when the sit all winter in the unheated barn with no electricity. Don't have the issue of electronics draining the batteries when they are sitting because neither if them have any complex electronics in the to fail in the first place, I added the master disconnects because a flooded cell battery when sitting, but out of circuit, only looses 5% of it's total charge per month and when I park them, I'm always cognizant of the batteries being at 100% charged and... Flooded cell batteries don't fail because of the cold ambient temps, they fail because of HIGH ambient temps and / or parasitic loss so removing them from circuit eliminates those issues. A fully charged flooded cell battery is still viable at -40 degrees (f). Never gets that cold here. I doe's get well below freezing (32 degrees Farenheight) here in the winter. Do the same with my diesel pickup truck and even my diesel lawnmower and the motorcycles.
One thing I never do is run a battery for a prolonged period of time either. They get renewed every 4 years, good or not. My philosophy is any starting battery is a consumable item just like oil, fuel and air filters and gets renewed of a regular basis.
Besides, nothing is worse than a dead battery at the moment of truth...lOf course I don't expect Hay Dudette's snide comments to take that into account anyway. In my view, he lacks the intellegence to deduce things that are better for longevity.