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A friend is a rigger and they used those to safety off to pipes when doing big jobs (he helped build Cabella's sites e.g.). They still only have a 5000 pound rating but are useful at times.

For life support I would take the Portie out of the equation...just use the big biner thru the receiver hitch hole...maybe multiple biners to increase the bend radius. Not sure if that is "approved"......but..I would.

I used a highline here to keep my weight off an ivy covered tree that was uprooting.

That is a highline...precisely what I thought about suggesting but got the impression there weren't many good sized trees around. I have done that several times...worked well.

Looks like a cool job! I have anchored a PortaWrap to a receiver hitch before to lower limbs...just had to be cognizant of sharp edges like Bermy said. We used a big carabiner where the ball would go.