The Texas title is a Statement of Ownership
In Texas, the ownership paper for a mobile or manufactured home is a Statement of Ownership from the Texas Department of Housing and Community Affairs, Manufactured Housing Division. People still call it a title. Since September 1, 2003, older documents of title are treated as Statements of Ownership, and that record is where you look for the owner and for liens filed with the department.
This is general information from public Texas sources, not legal advice for your home.
What the statement is
The Texas Department of Housing and Community Affairs, Manufactured Housing Division issues every Statement of Ownership in the state. The division's Statement of Ownership FAQ says that before June 2003 the paper was a certificate of title, and that on September 1, 2003 outstanding documents of title became Statements of Ownership. The statement is what confirms ownership and the liens recorded with the department.
Texas Occupations Code Chapter 1201 is the Manufactured Housing Standards Act. Section 1201.214 is the sentence that turns old titles and certificates of attachment into Statements of Ownership. You do not go to the county tax office or the department of motor vehicles for this document. Those offices handle other jobs. The statement comes from the Manufactured Housing Division. The FAQ says you may go to the division in person, and that doing so does not speed the application up.
Personal property or real property
The same FAQ says a manufactured home is personal property unless the owner elects real property on a completed application, pays the fees, and records it with the county clerk. Section 1201.2055 says the owner can elect real property only if the home is attached to land the owner owns, or to land the owner leases under a qualifying long-term lease. The department then issues a statement that shows the election. The election is not perfected until a copy is filed in the county real property records and the department and the chief appraiser of the appraisal district are notified. Until that happens, it is not finished.
Section 1201.222 says the home is treated as real property only when that election was made and a copy of the statement was filed in the county records. If you own the lot and the home may already be part of the land, read selling land with an old mobile home before you assume a deed covers the home.
If the home is still personal property, section 1201.206 says ownership does not pass or vest at the sale until a completed application for a Statement of Ownership is filed with the department. The seller of a personal-property home is supposed to get that application in within 60 days. The TDHCA instructions for applying for a Statement of Ownership explain the deadline. There is no fee to you for selling to me, and I pay the closing costs. The state's own application is a separate step, and that page is where the division describes it.
Lost, in someone else's name, or the owner died
That is a different job from reading a statement you already have. The page on selling without the title covers a lost statement, a record in the wrong name, and heirship when the owner has died, including the TDHCA forms. I still need you to say which one it is. A lien on a statement you do have is on the selling with a lien page.