For the
mast specifications of a cruising
boat, running backs are mainly needed when winds pipe up. One of the first W32's to make significant
passage did a roundtrip to SoPac without
running backstays. He got caught in some bad
weather on the sail down from the
PNW on the last leg of the trip. He happened to look up at the mast and saw it pumping so badly from the staysail stay/sail that he immediately turned left into SF and installed running backs before continuing onto to SoCal. Of course that was after he'd sailed the boat well over 10,000 miles without running backs.