I've been hammocking for five years now and use a HH ULBA with ring buckles and straps, DIY KAQ and, until Christmas, the smaller stock HH tarp. Santa brought me an Equinox 8x10 silnylon tarp (Campmor). I had my sights set on the Macat from OES, but who can argue with Santa?
I have had shock cord tarp tensioners on both side tie outs and one of the ridge tie outs. It saved the tarp in 40 mph winds and keeps it nicely taut otherwise.
My questions:  the seam and ties will run transversely pitched along the 10 ft axis. Do I need a ridge line under (or over) the tarp to support the fabric and, if so, does the constant abrasion ruin the silnylon? In other words, can grommets handle the tension without additional support?
 I have been searching the forums here and it appears from the photos that only about half seem to use tensioners. I have played with most of the designs and like the shock cord type. But, now I would need quite a few. Does everyone use them, and what type?
Happy New Year to all!