Cabledog, Henro and all others interested. I am a lawyer and have handled insurance coverage cases, for both insurance companies and insureds, on and off for about 25 years. FWIW, unfortunately, there is no single answer, much less a simple one, because the language of policies varies from company to company, except for some particular kinds of insurance (such as your basic auto liability coverage) where the policy language is mandated by law in some states. My impression is that Kubota insurance covers only loss of the tractor and perhaps only for the life of the financing (and maybe only up to the amount then owed), but I have not seen the policy language. It seems like a reasonable inference since the reason that Kubora offers such insurance is to protect its extension of credit to buyers.
Homeowners policies vary quite a bit from company to company and the language may or not be dictated by law depending on the state you live in. Generally, homeowners' policies do not provide coverage against liability for incidents that occur away from the home but do provide coverage against losses to at least some kinds of personal property even away from the home. Whether a large $ item like a tractor would have to be specifically scheduled (i.e. disclosed to the insurer at the time of the contract), and whether, even if disclosed there would be coverage against loss away from your home, again depends upon the policy language with respect to personal property coverage.
If you use your tractor off premises (such as snowplowing a neighbor's driveway or doing some landscaping) or more obviously, if you are paid for using it to do work for others, it is virtually certain that your homeowners does NOT provide liability coverage for that and you would need to get some business liability (CGL) coverage.
In short, the only way for anyone here to decide whether their present insurance provides "tractor coverage" and if so, for what perils and in what amounts is to read your policy carefully FIRST and then ask very specific questions of your agent and, if you deem it important enough, ask, as Henro suggests, for confirmation in writing.
Sorry that I can't be more helpful.