all yards in san diego except one use slings/travel lifts---the rails are being replaced as they take up too much space in the already over crowded yards....all boats, power and sail, use he travel lifts now--is not just for large yachts or power boats....the trimaran and catamaran owners are finding there are few yards that actually will do the haul outs...Hey guys, this machine is for the heavy power boats (big yachts!). Multi-hulls use rail systems, not straps.