If you have or can get a notarized bill if sale from the guy you bought it from that should work to get a title on it. Ideally the seller would have had (usually someone from the sheriff's dept) inspect it and fill out the form that they use. If you haven't touched it yet and are inclined to do that I would see if you can have it inspected and give you the filled out inspection sheet. Your reason to give the sheriff is that it has been sitting on your property for X amount of time and you would like to do something with it. They run the vin and make sure it isn't reported as stolen and then you proceed to get it in your name.
There are fully legal ways to do these things but you do have to do your homework and jump through a few flaming hoops some times.
The GA info is here
https://etax.dor.ga.gov/ but I think we have a lot simpler way of doing things here in WA.
And it looks like there are some flaming hoops to jump through. The main thing is that you want to be proof positive that the truck wasn't stolen at one time and dumped on that farm. If it has an old tag on it or an old registration slip or old insurance slip in the glove box there is a pretty good chance you can do some hunting and get it squared away.