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I have a problem with my Superduty which led me to this site which seems to have a lot of knowledgeable members:
The last few (very cold) mornings, the two driver side tires on my 2006 F350 have been completely flat. I know the cold will have some effect on the tire pressure, but there is obviously something wrong here. No one at the tire place or the dealership could ID the problem. I have had the tires checked for leaks, remounted, and had the valve stems replaced, but the problem continues.
I have the factory option 18" aluminum rims with Continental Contitrac TR LT275/70 R18 tires.
Try giving the valve stems a wiggle and see if there is a leak there. I had an issue with improperly fitting stems and they caused my brand new tires to go flat. I had them replace all of the valve stems and the problem is gone.