A friend of mine is a manager at a local Ford dealership and currently drives an Expedition EB 4x4. On it they have put a set of Cobra R rims (with 285/50 series tires I think) and let me tell you, it looks nice!! No lowering or suspension mods at all (it does have the load leveling air suspension - stock). So if the Cobra R's will hold up an Expedition, they shouldn't have any trouble with our lightweight Explorer's.