Some truckmakers fiercely lobbied for reductions and other stakeholders warned about the potential for sweeping tariffs to cause higher vehicle costs, which could also ripple through the construction and shipping industries. The USMCA exemption could potentially dull the impacts on Ram pickups made by Stellantis NV in Mexico, representing some of the roughly 245,000 medium- and heavy-duty trucks imported to the U.S. last year, according to Commerce Department data.