I have two sets of Whoppie slings attached to my 12' long tree straps. My longer whoopie set (6') I use for my hammock and the shorter one (4') I use with a 10x10 Silnylon tarp where I gather each end in a knot and make a gear sling. Both are attached with a Marlins Pike and a biner. With the 12' long straps I have full flexability on where I put my hammock and gear sling. It also gives me a lot of distance to hang if trees are farther apart and I just wrap up the extra strap and tie it off to itself.
Hope this helps.