I have 2 thoughts/comments.
1, In the last shooting it was very savy for the shooter to do his deed in the rain.
This prevents or at least hinders any sniffing done by a dog to define where the shot took place as was done at the school.
2, I truly feel that the white box truck is a distraction meant to draw attention away fron the shooter. Everyone is transfixed on it while he quietly slips away. Plus if the cover vehicle is stopped, searched, sniffed it will be quickly be sent on it's way as there is no evidence.
Thoughts?
Del