Texas Transportation Code - TRANSP § 643.057. Additional Vehicles and Fees

(a) A motor carrier may not operate an additional vehicle requiring registration unless the carrier pays a registration fee of $10 for each additional vehicle and shows the department evidence of insurance or financial responsibility for the vehicle in an amount at least equal to the amount set by the department under Section 643.101.

(b) A motor carrier is not required to pay the applicable registration fee under Subsection (a) for a vehicle for which the same fee is required and that replaces a vehicle for which the fee has been paid.

(c) A registered motor carrier may not transport household goods or a hazardous material unless the carrier shows the department evidence of insurance or financial responsibility in an amount at least equal to the amount set by the department under Section 643.101 for a vehicle carrying household goods or a hazardous material.

(d) The department may not collect more than $10 in equipment registration fees for a vehicle registered under both this subchapter and Chapter 645.