Actually, the pole is there to take all the weight....But...to put the stresses and forces involved into a more managable calculation.
With the pole hanging from the 2 tripods, the inward forces are mitigated so the tripods are now able to take the inward pull that would normaly be between 2 trees and transform that force to just gravity pulling straight down(no inward pull on the tripods).
The pole needs to be structural enough to take some inward pulling. By hanging the hammock in-line with the cord holding the pole up to the center of tripods(hinge), you minimize the pressure put on the pole. Just don't use too small or too weak of a pole since there is still some forces trying to squeeze the pole at the connection to the hammock.
Good luck and take pics when complete.
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