I don't mean this as an accusation, but how close were you following the truck? I'm guessing the thing fell out of the bed and bounced up at you? The logical side of my brain says that something weighing 4.6 kilos would fall out and generally tumble around the ground. Even in the bed of the truck it was probably barely at windshield height, so I'm guessing ( and by the sounds of it you may never know exactly) that it fell out, tumbled along the ground at 70ish MPH and caught a good bounce to meet your windshield.
Glad that your wife and family is OK. BTW, make sure your windshield is replaced with an OEM unit and the repair is done properly and not by some mobile truck hack. Properly installed, a windshield offers a lot of resistance to objects like you encountered. Improperly installed, they can make a bad situation worse by collapsing inward. Your side of the windshield staying intact was more design than miracle...
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