Suffice it to say, I am home. Barely!
I posted this and never quite explained what happened so am updating with details. I did indeed make it as SAG support vehicle all the way from start to stop (beginning and ending in Beatrice, NE), but just as I was coming in to Beatrice the last day I could hear a knocking noise that got louder and louder. As my ending was rebuilt a couple of years ago and had less than 2,000 miles on it I did not want to risk blowing the engine. Plus, it was about 100 degrees, so I knew the engine would be running hot anyway.
Once home I discovered a bolt that was put into an opening in the engine had worked its way loose and I was hearing the internal noise of the engine. Had to ultimately pull the engine and take it to a shop for them to fix it. A lot of hot, heavy work for one bolt.