Texas Transportation Code - TRANSP § 548.052. Vehicles Not Subject to Inspection

(1) a trailer, semitrailer, pole trailer, or mobile home moving under or bearing a current factory-delivery license plate or current in-transit license plate;

(2) a vehicle moving under or bearing a paper dealer in-transit tag, machinery license, disaster license, parade license, prorate tab, one-trip permit, vehicle temporary transit permit, antique license, custom vehicle license, street rod license, temporary 24-hour permit, or permit license;

(3) a trailer, semitrailer, pole trailer, or mobile home having an actual gross weight or registered gross weight of 7,500 pounds or less;

(4) farm machinery, road-building equipment, a farm trailer, or a vehicle required to display a slow-moving-vehicle emblem under Section 547.703;

(5) a former military vehicle, as defined by Section 504.502;

(6) a vehicle qualified for a tax exemption under Section 152.092, Tax Code; or

(7) a vehicle for which a certificate of title has been issued but that is not required to be registered, including an off-highway vehicle registered under Section 502.140(c).