if it's a trailer that was manufactured by a company or has been previously titled, you're in a bit of a gray area. technically and legally, you're supposed to follow the proper avenues to get a replacement/duplicate title from the last person it was titled to. that can be a pain if not impossible unless the person is readily available. however, you can easily play "dumb" and pass it off as a trailer that's never been titled before. it's next to impossible to not be successful. even if by some miracle you screw it up, all they'll do is deny your application. so, if you have knowledge it's been titled in the past, i guess it becomes a moral judgement call. do the means justify the ends so to speak. personally, i have no problem with it. the same goals are still reached either way. the state still gets their money, you've done the "right" thing by making it legal, you're able to register/tag it, it's able to be identified in the event it's stolen, and you're able to pass it off to a new owner in the future with no problems.