An interesting point from the FAA release:
"Unsymmetrical tie-downs permit load distributions that may ultimately result in tie-down failure.
Such a failure would result from the different load-deflection rates of dissimilar materials or of identical materials of different length.
Any material subjected to a tension load will stretch. A longer length tie-down has more stretch potential than a shorter length tie-down. If two tie-downs of the same type and capacity are used to restrain a load in a given direction and one is longer than the other, the longer tie-down, with its greater stretch potential, will permit the shorter tie-down to assume the majority of any load that may develop.
If the shorter tie-down becomes overstressed and fails, the longer tie-down would then be subjected to the full load and it, too, would likely fail. Therefore, symmetrical tie-downs should be as close to the same length as possible."
If you had it rigged differently from that suggested method they point to, what could happen is ... you'd hear "snap/ snap /snap" as the sound of restraint failure in series as three tie-downs of different length gave way when each of them took most of the load three of them were supposed to share.
