The trailer stored at DM's mother's did not have any mud on the tires in the media photo's I have seen. Ironically, a dodge Ram is used by the police to take it in for evidence.
I don't think they were bright enough to remove soil samples. Which makes me believe the trailer was waiting in a paved area. Where?
The seats were removed, means blood was drawn, my thinking is that Tim was shot. Only the LE knows if a bullet was found in the remains of his skull (gross to think of). The crime was committed after dark, on May 6th the sun sets around 8:40, so they can drive to their destination with Tim slumped in his seat or MS holds him up.
The removal of the seats what seat front and back...I don't know. I am assuming all the seats as blood does splatter, can you drive a truck without a seat? It has to be driven or pushed into the trailer. I reason I am obsessing on this is that there are seats missing, that have to be disposed of and where or how are they disposed of and not found. The metal frame would remain even if burned.
The seats if not found on the Ayr farm are they trophy items in someones home? I am going off topic as we were looking at what truck pulled the trailer.
In my opinion the trailer and drive away truck where left at a pre-planned point that was assumed safe up till Wed May 8th. Again you need two drivers to move vehicles.
I think the Waterloo airport does have surveillance cameras pointed to the front entrance, crap, I was there six years ago for a job interview and could swear there were cameras on every roadway within the airport. I have to take a trip out there to see plus enjoy watching a few big birds take off come Tuesday.