welcome to the forums
i agree with your concern in regards to potential damage to trees, as i've stated several times on here (not much of a popular opinion as you can see
). but you don't need to make the entire ridgeline out of webbing, just use the treestraps that your hammock is suspended to (i described this a while ago in a thread called "the levitating tarp" or something of that sort; edit:
here).
this way you get the full protection for the trees, and you also save line you would have to otherwise wrap around the tree just for the tarp, and save a lot of trouble (i just connect my tarp ridgeline to the treestrap with a softshackle on each side, and then pull the ridgeline through the tensioners to adjust tension, it litterally takes seconds)
edit: <sigh> and i failed to answer your question (sorry, should have coffee first, answer after)
to your question: prusiks themselves are the wrong tool for the job even on rope, imo. rope on webbing, they will be quite a pain (they will hold fine, but they will be terribly jammy). for attaching the ridgeline to "normal" treestraps (before i redesigned the treestraps too), i was using a piece of paracord or equivalent, with either a one wrap klemheist or even a larkshead (so one wrap prusik you might say). i preferred the klemheist (although i don't use it for anything else), thin (3-4mm) rope on webbing will work very nicely. now, if you'll be using ultralight dyneema webbing, that might be a different story. if it proves to be too slippery, you can always use a blake hitch, or a valdotain tressee (that is to say, proper friction hitches, not prusik :P ). i would still advise to consider hooking on directly to the treestraps (so reusing the hammock suspension treestraps tosupport the tarp too), and using a "normal" ridgeline, as i noted above.
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