I'm kind of in the same boat (no pun intended). I have an old canoe that I bought from someone, off of craigslist. That was several years ago. Just a few weeks ago I picked up a trolling motor. I need to get the boat registered, but in Knox County they require a notarized bill of sale. Turns out I can't register it at all.
The county clerk said that I might try surrounding counties, that they might not care about bills of sale. Anyone know if that's the case?