Final answer:
The largest no-zone for a large truck is located at the US-Mexico border in McAllen, TX, due to the mention of NAFTA and the reference to the truck being leased from there. The reference also highlights the irony of the truck's engine.
Step-by-step explanation:
The largest no-zone for a large truck is located at the US-Mexico border in McAllen, TX. This is where the truck mentioned in the reference is leased from. The significance of this location is highlighted by the mention of NAFTA, a trade agreement involving the United States and Mexico. The reference also mentioned the irony of the truck being powered by a Cummins diesel engine that could have been manufactured in Mexico prior to NAFTA but after NAFTA was surely built in the United States.