+1 for msh with toggles and whoopies on my wbbb and grand trunk ul. easy to release! :-)
on my hennessy i use a garda hitch on the line and a biner on the tree huggers. i did the figure eight before that. planning to do a whoopie conversion one day.
on my tarp rl i use a grapple hitch. since my last trip i started using exped 'self tensioners (a knot bone). they are attached to the ridge line w/ grapple hitches too.