How was the shuttle transported from point A to B in the seventies? Hint: convential truck & trailor setup.?

I recall reading a trucking magazine in the seventies and the cover (feature) article was about the then space shuttle being transported on a low-bed conventional truck from point A to point B (no people, the shuttle wasn't a 90's invention!). I was a truck fanatic at the time and used to buy/get magazines imported from the U.S. to Australia. The feature article was about the truck not the shuttle. For example, the fact that the truck concerned - I think a specially-built Petebilt cabover model that had a 75 gear gearbox in order that it could travel slowly enough so as to take all necessary precautions with transporting what was probably the most world's most expensive (road) payload to its home or compound or launch location, was the truck of interest but, I can't recall whether the magazine was the once-famous OVERDRIVE magazine or not, but for the life of me, I cannot find a skerrick of information about the original article.