the only purpose for a traveler in my opinion is for better access to the lazarette.my idea conforms to the K.I.S.S. theory----a 2:1 purchase on the mainsheet.The less line in the cockpit the better. a single block amidships,sans the traveler and its "stuff" with oversized running blocks and no winch----no camcleat ---rather an oversized "jamcleat" and a larger than usual diameter sheet as well.dont forget to over size the thru-bolting and appropriate sized backing block under the lazarette.a good work out for the arms as well.