Don't know if this is much help or not, but thought I'd share the tiny bit I know.

I've purchased a couple of older motorcycles without titles. I have a friend who is in law enforcement run the VINs through the NCIC to make sure they're not reported stolen. From there, you can get in contact with ITS Titles in Las Vegas. For a fee (IIRC, it's about $165 for a motorcycle) and a bill of sale, they'll get you a new title and a tag from Maine. Take the title to the DMV in your state and transfer it and you're done! New title and your vehicle can now be tagged in your own state. This might help with the old trailer with no title mentioned earlier. Also, I don't see why you couldn't just leave that perfectly good Maine tag and title in effect (at least for a while). Since I live in NC and haven't followed through with this process yet, your results may vary.

Scott Franklin
www.NutDriver.org