An easy test you can do to visualize the forces applied to the rig would be to measure the distance between the outer tips of the bars without weight. Then have someone measure their distance with you lying in the bottom hammock. Finally, measure the distance between them with you lying in the top hammock. I am willing to bet they will be pulled closer together when you lie in the top hammock as opposed to when you lie in the bottom hammock simply based on the change in pulling angle. A simple way to visualize it would also be to tie a taught ridgeline at the top, and see how much it sags when you get in the bottom hammock, and again when you get in the top.
Don't get me wrong.... I think it's a really nice setup. I'm just trying to make sure you're accounting for the increased forces your mod is applying.
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