If there is no vin on a boat trailer and you have no other information how do you title register and tag a trailer?

Did you find a solution to your problem? I'm going through the same thing right now and am at my witts end with emotionless bureaucrats telling me I'm out of luck.

Any suggestions would be greatly apprecated....

I think you need to go to DMV and tell them that you built it yourself and that you need a VIN number allocating.