I prefer to hang my gathered end hammock directly from tree straps but, "just in case" the tress are not ideally spaced, I carry whoopie slings and a structural ridgeline.

I carry enough MSR Mini-Groundhog stakes for tarp and doors on a Superfly but, "just in case" I am hanging over soft duff I also carry 4 REI snow stakes.

My Dutch clips and toggles are always with my tree straps but, "just in case" I also carry a couple of dyneema soft shackles and a couple carabiners.

Happily my "just in case" gear has been much reduced over several years.