re: Where to get tractor insurance

Have you called your homeowners insurance company?

Service vehicles are automatically covered on most policies.
In Georgia, most policies do not have specific caps on those vehicles.
It is part of your personal property and subject to your deductible.

If you do anything commercial with the tractor (use it for commercial farming or use it at your neighbors for a case of beer), that would void the coverage on your homeowners policy, typically.