Don,
Just a heads up. I have seen forged certified checks. I only take them if I am standing with the buyer at their bank when they are drawn up. But even that does not guarantee they are good if the money was deposited to that account from another
chained fraudulent check.
Cash at their bank or money wired to your account. For an expensive car, like aircraft, use an escrow account. That way the car does not get released for 15 days to make sure that the issuing bank cannot pull back the money.
James