A: A Kenworth.
That was a hard one for someone living in Europe (and apparently not only for me, since the question remained unanswered for two days).
I'll go with something easier:
Very true. I tried to find an answer but I just gave up. Chrissi, you know your American trucks!
very good, yes the truck is a "KW" by Kenworth, or a "K-Whopper" as it is affectionately known by those who drive them. A bit of further trivia. the KW truck pictured in the film was not in use on the roads until the mid to late 1970's. So, using this truck in the section of the film set in 1963 is a error on the part of the crew in the film. It still looks good anyway!
Well, that was new to me. But you're right, the truck looks good. I guess when us Europeans think about an American truck, this is what comes to mind.
What made you think it's a cattle truck? I looked at some stills but I couldn't figure it out.