While alternative fuel commercial trucks are gaining interest from fleet operators, diesel is still set to dominate medium- and heavy-duty vehicles for several years. That statement came from Kary Schaefer, general manager of marketing and strategy for Daimler Trucks North America, during a keynote speech last week at the Work Truck Show in Indianapolis. Daimler Trucks is taking alternative fuels seriously, but it pales in comparison to its full diesel-powered truck lineup as the world’s largest truck manufacturer. Daimler’s Freightliner…