Well, I went to the DMV to get a replacement pink slip. According to my paperwork, all I need now is "verification of the vehicle identification number by a peace officer, an authorized employee of the DMV, or a licensed vehicle verifier." There's a form that the verifier fills out.
The trailer is immobile, so obviously I couldn't take it to the DMV and have them do it. Has anyone done this through county Sheriff, CHP, or a licensed verifier?