Another consideration is your hammock connection point. Just because the vertical beams are “solid at the top” that doesn’t mean your best connection point - from the hammocks point of view, would be at that top. Use the hammock hang calculator to determine your connection point height given the distance of your trees (the pillars) and the hammock ridgeline (for the height you like to hang).
http://theultimatehang.com/hammock-hang-calculator/
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