The pulley system is probably the best way to go as
others have noted.
As an option, perhaps, I use springs selected from Home
Depot that are about 6 inches long. I put a loop
of dacron between each end of the spring just in case
of failure.
They are installed at each end of the supports between
two trees.
The spring rate is subjective as you don't want it to
stretch too easily or be to stiff.
On my property, I have an endless number of trees so
I try to use the largest trees which will sway less to
minimize stress on the installation.
And, I use fishing arrows (which have weighted tips) with
a bow to shoot fishing line into the trees then 100 lb nylon
line to pull up the dacron rope.
This has worked quite well for over 20 years for me.
Jim, K1PX
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