I'd guess a stuck or frozen vent valve caused it... I would run her on the highway, in manual mode to keep her in a lower gear, at about 4500 rpm's for a few minutes to get the engine and cat converters nice and hot to burn off the residual oil in the system. If you get a fault for cat converter efficiency, clear it and don't worry about it, it may come on due to burning off the extra oil, but may not.

Once the extra oil seems to be gone and the X stops smoking, I'd have him do a compression test just for cylinder comparison for piece of mind. If it is all ok, enjoy driving your truck again. I wouldn't worry about taking the X on the road unless it is overly cold and you haven't done an oil change in a while. But more trips on the highway will actually help by keeping the excessive moisture from accumulating in the oil. Short trips don't let the oil get to full operating temperature to evaporate the moisture from it, and it accumulates in the vent valve which is what freezes to cause the problem you had.

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2003 4.6is