I suppose it is a dead horse by now, but just wanted to add another fact to the situation.
When OKC happened, I remember the Feebs saying that the delivery van had been traced back to the rental company by the serial number on the rear axle that had been blown away from the area. Well, here's the truth for you. At that time, I was working on the Ford assembly line in the Mustang plant, building up the rear axles just before they were put into the cars. I have no reason to believe that Ford would have done anything different for trucks. The rear axles we handled (ALL Mustangs were built on this line) did NOT have a serial number, or any way to trace a certain axle to a certain car. If there was any identification at all, it was a for part number, and a tag that showed the differential ratio. PERIOD. Any claim that they traced a specific axle to a specific car is BS!!!
Just a quick thought, in addition. In the photos of the building, didn't I see trees still standing just a little way from where the truck supposedly blew up? So, the explosion could tear the front of the building off but couldn't even blow the leaves off of a tree the same distance away?