While the 2010 federal regulations are for engines built beginning Jan. 1, the dates when 2010-compliant models become available will vary depending on factors such as the number of current models in inventory and the rate of sales, among others. The Japanese manufacturers will have significantly later delivery windows for 2010-compliant vehicles than domestically-built trucks and some models will not show up until 2011.
Beyond that, brands and truck models are leaving the market.
General Motors (Chevrolet, GMC brands) and Sterling Trucks have stopped producing medium-duty commercial trucks. Although there are units from those brands in inventory and being sold, model details are not included here.
Ford Motor Co. and Navistar International have halted production of their low-cab-forward models, the LCF and CityStar, respectively, due to low sales, and Mitsubishi Fuso will not offer its Classes 6/7 models after 2010 MY inventory is gone.