I've always used an over the top ridge but I also run a second underneath for hanging my underblanket and a few bits of kit from. Handy for hanging a torch from and muddy boots at the end of the day.
I also read here where somone suggested that it prevents losing the figure 9, when it is attached.Why a prusik with a Figure 9? A Figure 9 has adjustability built in.
My buddy Ken uses this set up ... actually had it on his rig at the Linville Gorge Hang (check out Shug's 3rd video).
He also just sent me a rig for my Equinox ... complete with continous loops for prussiks. I like it a lot. He's got a buried loop in on end that you fix with a "staub" as Shug calls it ... two prussiks for the tarp and one with the figure nine for the end of the line. Sweet set up for getting that tarp up quickly and then being able to find the sweet spot between the trees for you set up.
You da man Ken!
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Arrowhead actually offers a tarp ridgeline kit much like this using the nitize 's' style carabiner. His isn't for a full ridgeline (tree to tree), but just for attaching to the tarp ridgeline one each side, something I prefer. It works extremely well and very fast, it in essence gives you the quick adjustments of a full ridgeline without actually having one.
He sent me a video on how it works:
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