Mexico’s efforts to secure relief from US tariffs face a new complication as Washington scrutinizes Mexico’s use of Chinese-made heavy trucks, according to the two reports. The outlets say Mexico has been building a larger fleet of these trucks and that the United States is seeking assurances that Mexico is not functioning as a backdoor route for Chinese manufacturers to expand access to North American markets. The concern centers on whether Chinese goods and supply chains are being rerouted through Mexico in ways that could undermine the objectives of US tariff policies. In response to the scrutiny, the reports indicate that US officials are tying tariff relief discussions to additional commitments or explanations from Mexico regarding sourcing, import channels, and end use of the vehicles. The situation highlights how trade negotiations increasingly extend beyond tariffs themselves to broader questions about manufacturing and distribution patterns across borders. The reports frame the trucks issue as an emerging factor in Washington–Mexico discussions rather than a resolved dispute.