Let me ask if I'm reading this right; I think I am. I'm referring to the third picture, with the red rectangle, and the description of that picture.
Your statement: "This is a close up of the toe portion of the print. Note the mounding around the front of the print and the small stones. The mounding ends at the tire print suggesting that the rear tire rolled over the mounding that would have extended further."
My interpretation: Jacob's footprint, the 'mounding' comes from the pressure when the print is made; it's broader to the left and right than it is at the toe, because, the 'mounding' made straight ahead in front of the toe, was tracked over by a tire print.
Your statement: "white stone in the car tire print has been forced into the ground, but by only one tire, not both. This was a stone roll from the mounding on Jacobs print."
My interpretation: The front tire has already rolled by, making the initial 'first tire' print, then Jacob's footprint is made, causing the mounding; and the one white 'larger' stone rolls forward from the footprint, and then the rear tire rolls over that. The 'second' tire basically flattens and embeds the 'mounding' from Jacob's footprint, but, since the one stone is a bit larger, it is not fully embedded because it fell there after the initial tire print was made, making the ground there a little more dense, then it's rolled over by the 'rear' tire only.
I hope I've got that right. That makes sense to me.
By the way, can you (or anyone) let me know how you make the colored lines, arrows, etc..., where do you start; I don't know at all how to do that.