Texas Transportation Code - TRANSP § 502.435. Certain Soil Conservation Equipment

(a) The owner of a truck-tractor, semitrailer, or low-boy trailer used on a highway exclusively to transport the owner's soil conservation machinery or equipment used in clearing real property, terracing, or building farm ponds, levees, or ditches may register the vehicle for a fee equal to 50 percent of the fee otherwise prescribed by this chapter for the vehicle.

(b) An owner may register only one truck-tractor and only one semitrailer or low-boy trailer under this section.

(c) An owner must certify that the vehicle is to be used only as provided by Subsection (a).

(d) The registration receipt issued for a vehicle registered under this section must be carried in or on the vehicle and state the nature of the operation for which the vehicle may be used.

(e) A vehicle to which this section applies that is operated on a public highway in violation of this section is considered to be operated while unregistered and is immediately subject to the applicable registration fees and penalties prescribed by this chapter.