canopyboy
ArboristSite Operative
As long as the pull is fairly vertical wouldn't a timber hitch suffice? I use it but I do like alot of wraps. Of course retrieval from above is not gonna happen, but then again somebody is always below me.
I have trouble trusting a timberhitch unless it's under constant tension, but that's just me. You could add a tie-off to make sure it can't work loose, and your extra wraps help as well. But I don't think most people would think of it as a life support knot. Maybe I'm wrong.
Personally, I just terminate the end of the line with a biner, take 1 or two wraps around the tree (depends on if I think there is a chance of it sliding), and then clip the biner to the running side of the line. Cinches up tight, installs and removes quickly even in the middle of a long line. I just try to make sure that the biner is properly loaded. I know there are those that try to eliminate extra biners in their system, but I find it too easy and clean not to use one for my tie-off.