The first boat i bought this year was that way , no papers . He made me out a bill of sale with his name on it with the registered numbers from off the boat , the boat serial number , with that information on the bill of sale i sent it in amd low and behold a new title came back in the mail with my name on it as the new owner , as for the boat trailer , take your last known plate number the trailer had on it with you as long as it was regestered to you , they will make you out a new ownership for $10.00 .The plate number is all you need , Its all pretty easy .