Hi Don,

In Germany, we use a few feet of firehose to suspend gliders from the
hangar roof. Advantage: You don't have to put knots into anything, you
can fix it with bolts right through the hose. Just like you suggested,
you make two slings, one well before the COG and one behind. You don't
necessarily have to attach it to the COG - hook, you just have to level
it out right.

Chris