Strick, not so for mud!!! Now back in the days of the model T and model A Fords, they used narrow tires because 95% of the roads back then were not paved, some rock yes. Many turned real soupy once the rainy season hit.
Those narrow tires would go right on through the mud without hanging up and that is another reason why they had running boards back in those days.
They also did not need a ton of horsepower to propell them through the thick stuff, there was little resistance to those narrow tires.
