Where are you going to find a 285 with a smaller sidewall ratio than 75 for a 16" wheel? I have seen a few 70 series tires in 285, but you are still looking at 1.25" taller than the 245s then, and every tire I have seen in that size is only load range C.
Also keep in mind that wider tires do not always equal better traction. Assuming conditions and loading are the same, a skinny and a wide tire will provide the same traction due to the ground pressure decreasing under the increased contact patch area of the wide tire. Now when you take deformation of the tread into consideration with a rough surface the wide tire will benefit simply by having something more to grab onto such as offroad situations. The wider tire will be more susceptible to hydroplaning, have less traction in wet weather, ice, and will hinder braking performance, acceleration, and fuel mileage due to increased rotating mass, not to mention the reduced mechanical advantage that is obvious with the larger diameter.
