OPCOM, ditto my situation, except I have 4 trailers in the same 'limbo' status. Luckily, we are all in Texas, so I am hoping that you post your follow-up if you manage to get this one sorted out. If I get any of mine legally titled and registered as HMV's, I will be sure to let you know how I accomplished it. I wish I could click on the above URL, but I'm at the Ranch on a dial-up and, oh hell, I just clicked on it. Ahhhh.... wait a minute, that URL is to help you get a certified copy of your title, but the way I understand it, there already has to be a Texas title in the records. Perhaps you can research the missing title with the VIN number, perhaps not. So, maybe the URL will help, maybe not. Flatlander, I'm not knocking your contribution, and I think it's great that people bother to take the time to help each other.
Here's an interesting Texas tidbit, the DMV told me that a trailer that GROSSES under 4000 pounds does not need a title. You just run it (or transfer ownership) using the registration paperwork only. Of course, this does not help you with an M105, unless you register it as 3980 GVW. AH HA !!!! Think about it.