Tex. Health & Safety Code § 437B.154

A mobile food vendor shall make available to the department a list of all locations at which the vendor intends to operate, to the best of the vendor's knowledge. A vendor may provide the list of locations through the vendor's social media or on the vendor's Internet website. If the vendor does not provide the list of operating locations on social media or the vendor's Internet website, the vendor shall submit to the department in the form and manner the department prescribes a list of the locations at which the vendor intends to operate, to the best of the vendor's knowledge.