Originally Posted by Take-a-knee
I believe the simplest suspension mod is a treklite biner clipped to the tree hugger with an SMC ring clove hitched into the hammock rope. This is basically a trucker's hitch (the ring replaces the loop of the hitch). The ring functions as a pulley and you just tie a hennessy lash at the carabineer. The lash is easier 'cause you can just clip through the biner each time instead of having to feed the working end of the rope through each time. Best of all, you don't modify the hammock and it adds about 2 ounces.
If you pass the rope between carbiner and ring 3 or 4 times there isn't much pull on the free end of the rope (due in part to mechanical advantage, due in part to friction among the rope lengths that are all passing between ring and biner). You then don't need a Hennessy knot in all its gory, err, glory. What I do is tie it off with a bight in a half hitch, and then for safety's sake pass the free end loosely through the bight. This last bit gives some protection against accidently pulling out the bight tripping over the free end or something. Quick to loosen up and adjust if needed.