No manufacture purposely builds a lean in their MHs. Either the weight is quite a bit off from side to side, or Ford still has a weak spring problem. Ford makes the springs soft for a good ride. The camber in the roads is the main reason MHs lean to the right. They have a lot of weight high and the road camber causes the lean to the right, also, there is usually a slight wind, always from the drivers side causing more lean. This causes the springs to lose some of their arc in short order. Air bags, Sunmo, or Timbren helpers will help the lean, just try to keep the side to side bias within 250 pounds.