I bought a jet from a cat in Sacramento this summer, registered it in TX and didn't have the trailer title. I had last years registration, and some form for the trailer, but no title. The guy said he could get me one if needed, but I didn't need it. I think it had a PTI plate on it, that might have been why I didn't need the title.

I then had the option of getting a TX title for the trailer when I registered it and the boat.