Maybe they were being repaired like the Mexican airline plane we rode on a few years ago.
While boarding an Aero Mexico plane in Houston bound for Cozumel, we laughed about the patch of duct tape covering the nose of the plane. On our trip back home we suspected it was the same plane because the duct tape was still visable through the fresh coat of paint on the nose of the plane.
That gentlemen, is why I don't want Mexican trucks on US highways.
Does the “out of service” mean that they were in the repair shop?
My understanding of ‘out of service’ is the truck/trailer doesn’t move with the load until the repairs are done.