So late this afternoon, I followed the winding road I had seen them travel. I saw a Dead End sign but I kept driving. There were a few houses, some small ranches and the road kept going. Then no more houses, no side streets, no sign of construction anywhere.
I kept driving and came around a bend 2 miles past the Dead End sign and spotted this unknown valley. Beautiful, and it went for at least 2 or 3 more miles. No telephone poles, no houses, fences, just rolling hills with trees. It was like a paradise. As I continued on, I noticed barb wire fencing started on one side of the road. There was a sign telling me that this paradise lost was Pamo Valley Ranch owned by the city of San Diego. I snapped this photo as I was driving back.

I never figured out where the trucks were going but I got to see a beautiful view.