My plan is to use my (just now purchased) whoopies connected to a carabiner which is attached to a pair of tree huggers which are girth hitched to the tree... this should be enough distance for I'd think trees ~20-25 feet apart on a bad day... Sound about right?
I think you're on the right track, too, but I'd also suggesting using the marlin spike hitch and ditch those heavy biners...
Keep close to Nature's heart... and break clear away, once in awhile, and climb a mountain or spend a week in the woods. Wash your spirit clean.
- John Muir