Abstract: A seat assembly for a vehicle having a seat back and a support member. The seat back is connectable to the vehicle for pivotal movement between an upright-use position and a generally horizontal-stored position. The support member is connectable to the seat back and pivotally attachable to the vehicle. The seat back and the support member are operable to form a truss in the upright-use position and a substantially continuous load surface in the horizontal-stored position.