It sounds like you have it covered 👍I have a Purchase and Sale contract that I've drawn up based on a raw template I found online. I have each item listed out, serial numbers where available, and a total cost. It specifically states "As is" and "No warranty".
We use a common brick and mortar bank - we're going to meet at a branch where he will make a "cash" withdrawal that I will then deposit into my account. We will then proceed to where the tractor and everything is garaged and he will load up and take away.