I've never titled a trailer w/o the paperwork, but I believe jimk is correct. I registered my XM211 in November with just a bill of sale. The bill of sale, vin tracing & digital photo (2 copies) and a DMV form signed by the previous owner was all I needed. (And paying the sales tax of course!) The transaction was flagged by DMV for investigation (several of the same VIN's in the system), but I ended up getting my transferrable registration in the mail in a couple of weeks.
Just ask your local DMV what you need and from my experience, they will help you out. When you don't have everything the first time ( and it will happen) just be "polite" and they will assist you in getting it done. In my case, it was a lot easier than I thought it was going to be! If all else fails, send GL the $60.
Hope this helps!