while I'm knot a guru, lemme ask: are you using line or webbing? are they permanent or temporary mounts? do you want just one LOOSE loop at each corner or are they tied tight around the corners?
for a tight anchored loop: take a line 24"-30" or so and make a fall loop at one end the size of your 'loop' plus the length of a half hitch knot. tie a tight half hitch (both lines) your desired distance up the line to create your small or large standing loop. take the line's other end around the crossbar and tie off tight with a bowline knot. I assume the tramp will keep them from sliding away.
the bowline will allow the lines to be removed from the boat, the half hitch will cinch up tight to hold your loop open.
_________________ Chris '88 H18SE Arís
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