Conventional practice is to find trees 12-15 feet apart and use the tree straps & buckles and/or whoopieslings sold by the vendors that are supported here. This is based on the hang calculator: http://theultimatehang.com/hammock-hang-calculator/ that seeks a 30* hang angle as the constant in all circumstances.
If you are able always to have a 30* hang angle then the structural ridge line (SRL) on your hammock is not critical to bearing loads. Now, in architectural/engineering terms if it does not bear a load it is not properly "structural." But that is what the lighter ones will be called.
Some of us live where trees may not cooperate so well or we otherwise have unconventional practices, like a single line suspension (SLS) that does not try to maintain a 30* hanging angle. In that case, because the ridge line is truly structural you need one that can bear the load of a shallower angle.
So, the first decision is whether you want to be conventional or stretch the limits of a hang with higher rated straps and suspension.
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