Looks as though you went right by us when the ambulance was there. It happened just after 9:30 am on 507. I am thinking I would have passed you somewhere around Longview... There was a pretty healthy tailwind for me most of the way in OR, drafting was not really that helpful at that point.
That is cool you were able to do it with your son. I think I may take my 12 year old next year on the 2 day adventure.