In about 20 minutes, I will be off to the DMV to get my 1955 Benroy registered here in California.
It's an original 57 year old trailer frame. The vin is barely legible.
It's been UN-registered for 20 years. DMV has no record of the trailer.
The trailer is listed to the guy who owned it before the guy before guy before I bought it (* three owners ago).
I plan to try and get PTI tags with YOM plates.
I have a bill of sale from each owner to trace the sale from person to person. I have a freshly restored plate from 51, with 55tabs. The vin has been acid washed and the number visibility improved a tiny bit.
How hard can this be?

Wish me luck!
Ted