The rope he was using appeared to be polypro orange and black truck rope. Non stretch but quite weak compared to a nylon or polyester rope. I have had a rope just like that break simply towing a car with no real strain other than the initial tug to get it rolling on pavement. I also have used an old, worn to the kern, climbing rope that held up to more hard pulling of a vehicle.

I think for a stuck auto, one would want stronger rope than polypro.