Order activity persuaded Cummins to raise its full-year industrywide North American heavy-duty truck forecast and revenue guidance for the engine division. (jetcityimage/Getty Images)Key Takeaways: Cummins raised its 2026 North American heavy-duty truck demand forecast to 240,000-250,000 units. Image RumseyThe company’s North American heavy-duty truck demand forecast is now 240,000 to 250,000 units, compared with prior guidance of 230,000 to 250,000 units. Cummins’ North American medium-duty truck market forecast is now 130,000 to 140,000 units in 2026, meanwhile, compared with prior guides of 125,000 to 135,000 units. Cummins’ engine unit saw a 6% increase in sales in Q2 to $3.08 billion from $2.9 billion a year earlier.