Legally Register Any Car

I'd bet most every state has a reciprocal agreement with states that do not title older cars. Most people just don't bother going to DMV to ask the question to in fact find out.
Hawaii is completely unique in this from what I have heard- they will absolutely not register a car without a title, period. I have asked the head of the DMV. There is also another hassle I have run into with motorcycles, it's also unique, as you have to "safety" the motorcycles and cars. I had a legal VIN number as a new bike, but it had to be on thier list to get the safety- the bike was titled in Alaska, completely 49 state legal, but couldn't get it safetied here to get the title changed due to not being on the "approved" list. I call it paradise tax LOL. Also, due to some arcane laws around the Jones act, they will not ship the car as a car, only as parts, without a title, and unless the bill of lading includes the title, the car is parts here from then on out- no reciprocity at all. There is another loop hole we have found a couple months ago involving standing in front of a judge here (Hawaii law structure also unique to Hawaii due to it being a kingdom before) - but it has nothing to do with Vermont or mainland titles LOL> however, I do know several guys now that had the vehicle titled in Vermont before put on the boat, and that went very smoothly at the DMV.