I agree. The video footage of him in the car park especially looked like he was having some sort of episode. It reminded me of that case about Elisa lamb, there's footage of her in a lift in a hotel acting really strange like she's scared and is looking round corners and going in and out of the lift and she ends up dead in the water tank in the roof of the hotel. The most common theory with her death also is that she had some sort f a break down, she had Bipolar as well iirc) here's the video (it's kind of creepy)
I also think that the truck could have caused alot of damage to him
..first episode.../Jack Wheeler...
Spoiler:
...I hadn’t even considered this connection with the case and them both having bipolar and both behaving anxious and erratically ...and Elisa Lamb was discussed loads on the forum back in the day of ‘spooky stories’....