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One of the trucks was named Sorcerer.

Same here. Recently a guy I know posted on FB "Back in 1977 everyone told me Star Wars was the best movie of the summer. I told them Sorcerer was the best movie of the summer" and he posted a jpeg of the truck/bridge poster. I was 8 in 1977, and I don't think I've ever really thought about that poster since then, but as soon as I saw it in his post I totally remembered it. I must have spent some time staring at it on the theater wall while I was in line waiting to see Star Wars.