One thing to bear in mind is that if you insure the tractor, or other similar equipment for loss, unlike a car or an ATV (learned those the hard way!) you have agreed the value of the tractor, and that's what you'll be paid out if it's lost. If it's "included" unlisted in another policy, you may get a depreciated value instead. I was very happy to get the agree insured value for my tractor last summer, as I had had it insured for that value since buying it in 1995. It's "value" when it burned would have been less than what I had it insured for. So I got enough to nearly replace it with new. My smaller JD tractor, lost in the same fire was covered under my home policy, and I was happy to get that - the value was fair. That saved me from having to deduct it from the other contents insurance for my building.
Understand the policy, and understand your risk of loss. I walked away from an uninsured $40,000 airplane, and $10,000 Polaris, as I never considered burning to death as a way of loosing them - I figured if I buggered one of them, it would be just one, and I could still sell the wreckage. But, I was bright enough to insure the building and contents (and the tractor and excavator separately listed). Their insurance was so cheap (I think in the range of $50 for both), that I could not resist, and very wise in hind sight!
The math on the plane and Polaris was different, they're somewhat expensive to insure for loss, so I had the savings of not paying those premiums for decades, though the premium savings still did not amount to the value of the loss. I've insured all of my remaining and new equipment now....