Yes, all civilian car production in the U.S. was suspended for the duration of the war so the auto plants could be used to produce military trucks, tanks and aircraft.
May just be an advertising angle. But I do remember my grandfather telling me that a bad car will have holes in its floor after just one winter worth of slush and road salt.
The one in the brochure (a 1924 Model T) didn't have a fully enclosed cabin -- there was a windshield and a fabric top, but the doors were only half-high and didn't have any windows or bodywork above them, just big open holes.
So yeah, if you take one of those out in a snowstorm, you're gonna have a bad time :-D
Funny how this Ford was marketed only as a "summer and fall" car... Forget about the winter...
Also - interesting to note that I see no car model years between 1941 and 1945. WWII I suppose...