Texas Transportation Code - TRANSP § 545.409. Drawbars and Trailer Hitches;  Saddle-Mount Towing

(a) The drawbar or other connection between a vehicle drawing another vehicle and the drawn vehicle:

(b) An operator drawing another vehicle and using a chain, rope, or cable to connect the vehicles shall display on the connection a white flag or cloth not less than 12 inches square.

(c) A motor vehicle may not draw more than three motor vehicles attached to it by the triple saddle-mount method.  In this subsection, “triple saddle-mount method” means the mounting of the front wheels of trailing vehicles on the bed of another vehicle while leaving the rear wheels only of the trailing vehicles in contact with the roadway.