I got caught up in two detours: a discussion of the colors blue and grey, and then an Oscar Nite viewing of the movie in Bay City, Michigan!!
Let's see, where were we. Oh yes, on the fourth sentence of the story, still in the prologue. Actually, what torqued me back to thinking about this story was RodneyFL's eloquent reading of it on Brokeback Mountain Radio last THursday. I was struck by how often the word trailer appears in the prologue. There are two: the trailer that Ennis lives in (altho he's about to leave it) and the horse trailer with which he's going to transport his horses to a new home, or more likely to his married daughter's home. Then, there's the ever present wind. The wind, as Jack's memory, is always with Ennis. There are metallic things, not only the trailers, but the keys that drop into Ennis's hand, with a jingle jangle morning sound (nod to Bob Dylan).
McMurtry/Ossana picked up on the significance of the trailer, and added a trailer shot at the end of the movie. Since there was no prologue in the movie, they added an epilogue instead.