you misunderstand. nowhere in my original comment did I say 'saddle'. no one is talking about the forces on the saddle.. my concern is not about the seatpost or the saddle. my concern, my earlier comment went to the rack mount and the additional weight increase on the rack and rack mount required to counter the long moment arm created by the horizontally extending load. the shorter the moment atm, the less strong the rack mount and rack can be, the lighter the rack.