Semi-trailer Market Size & Forecasts 2026-2035, By Segments (Product, Length, Tonnage, Number of Axles, End User), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (Wabash National, Schmitz Cargobull, CIMC, Great Dane, Utility Trailer)