Tex. Transp. Code § 547.372
(a) If a unit of farm equipment or implement of husbandry is towed by a farm tractor and the towed object or its load extends more than four feet to the rear of the tractor or obscures a light on the tractor, the towed object shall be equipped at the times specified by Section 547.302(a) with at least two rear red reflectors that are:
(b) If a unit of farm equipment or implement of husbandry is towed by a farm tractor and extends more than four feet to the left of the centerline of the tractor, the towed object shall be equipped at the times specified by Section 547.302(a) with a front amber reflector that is:
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.