I asked the same question on several tractor forums about a year ago. I realized the lawn and garden equipment didn't have titles, but I thought that big tractors did. What i found out was that at most you will get a bill of sale, or reciept. Everyone that responded said that their state didn't offer titles, even if it was licenced for road use as an agricultural vehicle. But I didn't get a response from all 50 states, and also did not get responses from any official state office. As mentioned above, I'd record the serial numbers, take photos, and keep the info in a safe place.