THAT's what those were!
Came across the article "Minnesota Aims to be Model for Wind Transport" and when I saw the photo of the nacelle (don't ask me how to pronounce that) on the flatbed semi I realized, "That's what we saw coming down the freeway!" On at least two separate trips, Ruth and I spotted these coming the opposite direction, and had no idea what they are. They look like a missile cone, except that no missile would have things jutting off the side of it...
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