The United States also transports nuclear weapons in ways that are not obviously a transportation of nuclear weapons, including in seemingly unarmed semi-trucks

The United States also transports nuclear weapons in ways that are not obviously a transportation of nuclear weapons, including in seemingly unarmed semi-trucks for thousands of miles. Its a pretty effective way of moving things that need high secrecy and present logistical challenges in required protection. In the past highly valuable items have been moved using mundane methods with little fanfare.