Transport Refrigeration Unit (Tru) Market Size, Share & Demand Report By Vehicle Type (Light Commercial Vehicles, Medium Commercial Vehicles, Heavy Commercial Vehicles, Trailers), By Power Source (Diesel-Powered TRUs, Electric TRUs, Hybrid TRUs), By Application (Frozen Food Transportation, Dairy Products, Pharmaceutical Transportation, Fresh Produce Transportation, Chemicals & Specialty Cargo), By Temperature Range (Single Temperature, Multi-Temperature), By Region & Segment Forecasts, 2026–2034