"The second pic is a diagram of an anchor system I have used with success. It is based on a continuous loop of Amsteel, 12-15' total circumference and three long stakes. Arranged in three loops and run through a carabiner it self-adjusts so that the force is distributed equally on each stake"
Go this quoted route. I have constructed a hammock stand with bipods as in the pictures with the jeep. The first time I tried to lay down in it (gently!) One of my plastic stakes holding the guy lines from the bipods broke in half underground, launched itself towards me, and implanted itself partway in my thigh. After much cursing and basic first aide I replaced the single stakes in the ground with three stakes connected by a continuous loop as illustrated earlier in this thread (not the in-line method). I have had no problem since.
I haven't done the math on this either, but I can tell you from practical experience that the pulling force on your guy lines is several times your own body weight.
I will be bringing my setup to the Ozark Hang in March if anyone wants to see it. It cost me about 20 bucks total to construct. Close-out on hardwood 2X2 tall planter stakes for the bipods, 2 eye bolts with washers and nuts, 12 stakes, and whatever line I had laying around. The close-out planter stakes even came pre-drilled so all I had to do was measure and cut line.
Make sure you have some way of keeping the feet on each bipod from splaying out to a 180degree angle. From your pictures it looks like you are relying on the tightness of the eyebolt to keep them from splaying. That and the friction of the feet on the ground. At some point this combination will fail and you will go from hanging comfortably in the air to landing painfully on the ground. This, again, is painful experience speaking.
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