Heavy Duty Trucks (6-8 Class) Market Size, Share, Industry, and Industry Analysis, By Truck Class (Class-6, Class-7, and Class-8), By Weight Limit (8000-11000 Kg, 11000-15000 Kg, and 15000 Kg & Above), By Fuel Type (Diesel, Natural Gas, Gasoline, Hybrid, Electric, and Fuel Cell), By Application (Construction & Mining, Freight & Logistics, and Other Applications), by Regional Forecast, 2026-2034