Setting up a shady spot is going to be difficult. Forget the polyit'll be difficult to set up, is apt to tear, and its flapping will drive you insane (of course, I already think you're insaneB). You might try one of the Moss wing-type tarps; very well-made, aerodynamic tarps that can take as much wind as anything in this category. Take a look at the MSR (formerly Moss) Vistawing ($159); it's a roomy tarp that four or five people can stand or sit under. Pretty light (four pounds) for it size, and fairly sturdy. It's designed to take wind. Whether one can stand up to steady, hard wind blowing across the Texas plains is another matter, but they should give you a pretty good chance of getting some shade.
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