ntxtrapper, He was adding to the "not on public land" reply of my question.
TITLE 31 NATURAL RESOURCES AND CONSERVATION
PART 2 TEXAS PARKS AND WILDLIFE DEPARTMENT
CHAPTER 65 WILDLIFE
SUBCHAPTER H PUBLIC LANDS PROCLAMATION
RULE §65.201 Motor Vehicles
(a) It is an offense to not confine motor vehicle use to designated roads, except parking is permitted on the shoulder of or immediately adjacent to designated roads, and as provided for a disabled person or for a person directly assisting a disabled person.
(b) It is unlawful to hunt any wildlife resource from a motor vehicle, motor-driven land conveyance, or possess a loaded firearm in or on the vehicle, e
xcept as provided for a disabled person.
(c) A disabled person may possess a loaded firearm in or on a motor vehicle and may hunt from a motor vehicle except only paraplegics and single or double amputees of legs may hunt migratory birds from a motor vehicle, provided the motor vehicle is not in motion, the engine is not running, and the motor vehicle is not located on a designated road, designated vehicle parking area, or designated campground.(d) Except as authorized for specific areas and time periods by order of the executive director, or by written permission of the hunt supervisor or area manager, it is an offense for an individual other than a disabled person or a person directly assisting a disabled person to operate an off-road vehicle on public hunting lands. A person who uses an off-road vehicle to directly assist a disabled person under the provisions of this subchapter may not use the off-road vehicle to travel beyond normal speaking distance of the disabled person:
(1) except to return to an authorized road or trail; or
(2) unless such use is authorized by the department on the unit of public hunting lands at that time.
(e) The provisions of Chapter 59, Subchapter J of this title (relating to Off-Highway Vehicle Trail and Recreational Area Program) do not apply to a disabled person or a person assisting a disabled person who is participating in department-sanctioned activities on public hunting lands.
The exception for migratory game part in TPWD code is there because of Title 50, code of Federal Regulations, Part 20 and would apply to both private and public land. .....
except that paraplegics and single or double amputees of the legs may take from any stationary motor vehicle or stationary motor-driven land conveyance. "Paraplegic" means an individual afflicted with paralysis of the lower half of the body with involvement of both legs, usually due to disease of or injury to the spinal cord