I financed a small part of the purchase of my tractor (
L3410) in order to qualifiy for the Kubota insurance. It's not a bad deal, and the rationale for Kubota is obvious. If the tractor sustains damage, from a whole bunch of things (read the contract, it's not that complicated, really), the damage is covered. That means if Kubota repossesses your tractor if you run it into a ditch and "walk away", they aren't out any money - insurance pays for the damages. However, if you run over someone, your friend falls off your tractor or loses some digits in the PTO, etc. - you've got major problems. No liability, no medical payments, etc. So, you can use the tractor (you've got medical insurance, right), but don't loan it to or hurt anyone else. Otherwise, and I've checked a number of tractor insurance folks, you are liable for all but physical damage to the tractor. If you have a rider on your home/property insurance that specifically mentions the tractor, great, to the limit of your liability (mine's 3 million - ever glanced over jury trial verdicts these days); if not, get one or consider yourself liable for whatever happens to anyone or anything (yup, in my state a "prize hunting dog" got zapped by flying debris from a brush cutter - dog's owner sued - no, I'm not a lawyer; it was covered by my local Newspaper) in contact with your tractor; the insurance companies do not consider a "real" tractor the same as a "garden" or "lawn" tractor. It took a while to get my tractor listed on my policy, and for good reason - the first fatality in the Afgan campaign was - a heavy equipment operator. A friend of mine, last weekend, asked if he could borrow my tractor to clear his back lot - Answer was no, but I'd personally do it when I could get a free Saturday.
Despite the above, I use my tractor weekly, and love it. Just be prudent around others, as it's your net worth "insuring" the tractor in most cases, not your insurance company.