I once put some PWC's on a credit card and the dealer was afraid of the credit card protection. They told me there is no 3 day right of rescission on motor vehicles, but that by buying with AMEX, the credit card company provided me the ability to return the Sea Doos in a few days. I told them I would sign an affidavit promising not to return them and they accepted the card. Small time dealer so take that with a grain of salt, but if I were in his shoes I would have the same concern.