Here's the arrangement on an old 15' IH 55 we used to use with 4" twisted shovels. Maybe it will at least give you a general pattern to follow.
Standing behind the plow and looking forward, left to right:Front row (closest to tractor): L - (tire) – R – R – L – L – (tire) – RMiddle row: R – R – L – LBack row: L – L – L – R - R