alright, probably a dumb question, but i gotta ask. what exactly is the purpose of whoopie slings? i've just recently switched to carabiner and webbing straps(gonna pick up some descender rings soon), and my GTUL has the the crappy S hooks and cordage still attached. so is the whoopie sling to replace the original cord? and if so, how long of a whoopie sling do i need? also, will the whoopie sling be adjustable(instead of using descender rings.) my plan is to use a carabiner for at the tree, and then attach another carabiner to the whoopie that's at the hammock and then to the webbing, so it's just a simple clip and hang. is whoopie a good idea for that? more or less is my set up a good idea? sorry for all the questions