I dunno. I have had my superduty for five years now and never put anything in the bed other that the 5th wheel hitch that is there all year round. I do have 4x4 and will use it when roads are slick but ice is ice and no matter what you have in the bed will stop it from sliding around on you if you hit a good patch IMO. Common sense and throttle control will help prevent that from happening and tires too to some degree. Some feel it makes a difference putting weight in the back but with these trucks I just don't see the benefit.