You're right about 300 lb SWL not being a lot, but remember that with tie down straps that's 300lb SWL per strap, giving you a 600 lb SWL for the system plus when you factor the industry safety factor of between 3:1 and 5:1 (I've heard both) you're looking at a minimum of 1200lbs and that's only double the SWL. Also, if I'm not mistaken, that is the SWL for the cam buckles, not the webbing the webbing is listed at a breaking strength of 800ish lbs each if I recall correctly.
I tested the strength of my stitching by suspending my body weight (195lbs) from a single strap and bouncing on it. From what I've seen looking at suspension systems, and someone who's not as much of a noob as myself please feel free to correct me if I'm mistaken, is that suspension systems give a weight limit for the pair, not per individual strap. If I'm correct on that, my $6 pair of tie down straps actually beat out a lot of the suspension systems I've look at for similar if not less weight. That being said, I'll definitely be upgrading to some ultra light ultra strong straps sometime in the future, but for now I'm satisfied with my cheap entry DIY straps.
I sewed a loop in the tree end so I had a loop large enough to pass he rest of the rolled buckle and webbing through to make it easier. Used carabiners on the hammock side and I have a super fast easy to adjust suspension system
Here are the pictures I promised.
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