>>2712017I'd go with 3mm dyneema for hammock suspension, just for peace of mind. The weight and bulk difference is negligible, it's easier to splice and I believe most hammock hardware is made with it in mind.
>Could I tie a structural ridgeline with a prusik to have the distance adjustable?You don't tie dyneema, you splice it. Look up "adjustable ridgeline" on youtube and there should be heaps of tutorials.
For the tarp you don't need (or possibly even want) dyneema since it doesn't stretch at all. Maybe I'm doing it wrong but I never managed to pull a dyneema ridgeline tight enough so that it doesn't hang loose a few minutes later.
After years of trial and error I ended up with 2.4mm 275 paracord for the ridgeline and some 2mm reflective cord for the guylines. I experimented with 1.1mm microcord but that thing is a pain to tie and untie, plus I realized I actually want to see my guylines when walking around the camp in the twilight.
There's also polyester covered dyneema that will take normal knots but I hated it. It's stiff almost like a wire and it loves to tangle itself and create bends and loops in the cord.
