We covered this in other threads but it's something that may be pertinent here as well.
Once a vehicle becomes registered, it's no longer covered on a homeowners or farm policy. This may apply to tractors.
My tractors and "stuff" are listed with my ins. co (State Farm) as being equipment to "maintain the resident premises" and are covered on my homeowners against theft, fire...
PA now requires ATV's and UTV's to be registered, titled (with plates). Once that happened, my RTV and the ATV I had listed as also to "maintain the resident premises" was no longer valid and not covered against theft, fire... If I put a plate on my tractor, it too would be dropped from homeowners and I would need to get a separate policy.