Well had a go at makeing my own whoopie strings out of 6mm Dyneema it has a breaking point of 1280kg.
I made them 6' with a 4'6" adjusterble loop so that gives me a 9' adjustment overall.
I tested them by fixing one end to a tree the other to the 9500lb warn winch on my landy and winch in with the brakes on the 90 moved without the whoopie breaking so should hold me in my hammock )
My next project is to build a treeless hammock rig
I made them 6' with a 4'6" adjusterble loop so that gives me a 9' adjustment overall.
I tested them by fixing one end to a tree the other to the 9500lb warn winch on my landy and winch in with the brakes on the 90 moved without the whoopie breaking so should hold me in my hammock )
My next project is to build a treeless hammock rig