Ditto to you quantum
Let me break what I said and respond. I can prove my point, and did. So can Bonkers. So can others on this site. You cannot dispute my/our experience(s), what I was told by DMV to start with, what I was told by SP, and how DMV failed to stand behind what they initially said. So as smart as you think you are, which is apparently quite smart, and also quite wrong, please continue on citing your generic web references and Google look-ups rather than actual firsthand knowledge or experience. "I saw it on the Internet so it must be true!" Sound familiar? Like so many others like you and before, press on valiant Internet Warrior, press on!
In the end however, mission accomplished. Anyone considering buying a trailer without a VIN and/or Title will be well informed as to the risk they are taking. I know how pissed I was when it appeared I had +$2000 into a trailer that couldn't be tagged. I only hope I can save someone else that experience. If possible, always always always go for the deal where the trailer has a valid Title and VIN already as regardless of the outcome, you will save yourself much aggravation and work.