Tex. Transp. Code § 623.421
(a) The department may issue a permit authorizing the movement of fluid milk by a truck-tractor and semitrailer combination that has six total axles and is equipped with a roll stability support safety system and truck blind spot systems:
(b) A vehicle combination operating under a permit issued under Subsection (a) may exceed the axle weights listed in Section 621.101(a) for the following axle groups if the overall distance between the first axle of the truck-tractor and the first axle of the first consecutive set of tandem axles is 15 feet or more, the overall distance between the first and last axles of two consecutive sets of tandem axles is 36 feet or more, the distance between each individual axle in each axle group, measured from the center of the axle, is between 48 inches and 54 inches, and:
(d) A permit issued under this subchapter:
Added by Acts 2017, 85th Leg., R.S., Ch. 750 (S.B. 1383), Sec. 2, eff. January 1, 2018.