I don't know about New Hampshire, but I can tell you what I would do in Washington.
Is the seller the legal owner? If yes, you go with him to the auto license place and he can apply for the lost title and transfer it to you ( when you give him money) at the same time.
If no-does he know the legal owner? If so...meet them both at the license place.
If you can't get the legal owner involved.... I would not buy it. They deliberately make it difficult so that it is less profitable to steal stuff. That is a good thing.
There is no easy process in Washington to get a title just by knowing the VIN. There is a way, but it involves registered letters and waiting periods, etc. then, if during the waiting period it is found that it I'd stolen.... You could lose it. it would have to be a pretty nice trailer, pretty cheap to be worth the PIA that can be....
For NH I would contact the auto license place and ask them.
I hope that helps.
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