If I was building a hay wagon though I would probably use stringers with less depth than the 2x12's I used. Maybe laminated 2x8's then use 4x4's perpendicular to that and run my T&G 2x6's lengthwise and perpendicular to the 4x4's which would also make them parallel with the stringers. This would help support loads out at the edge of the wagon.
tell me the design of a great hay wagon bed!!!!!!!!!!!
