I disagree. Rudder, then Elevator then ailerons. Regardless of how big the ailerons are, there is more strain on the elevators as they actually change the direction of the plane. The ailerons only rotate the plane, it does not change its direction. The overall weight of the airplane has little to no effect on how well the ailerons work. The elevtors can have most of the weight of the airframe on them at some times.