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I've noticed a similar effect on my coasting in the cold. I figured it was because things like bearings, fluids and the drivetrain in general (maybe the rear differential in your case) are all much tighter when its cold and are creating extra drag. Maybe the differntial fluid is slightly denser as well. Heat tends to make metals expand right. So mabye thats why the car doesn't roll as well. For example I've heard of people using dry ice to help press things into a motorcycle case. Never done it myself so I'm not sure if it works. Just a thought on why your truck might not roll as well.
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