While 8 miles of trucks might make an important statement, in the grand scheme of things they are but a drop in the bucket of all of the trucks that are out there on the roads driving and using fuel today.
I can't imagine it happening, but I am convinced that the only way that the industry will get any message is if a very large percentage of truckers park their rigs for a day all on the same day. THEN it might be a statement that will get some attention. And even then it's still just a MIGHT get some attention.