The choice of material directly impacts payload capacity, durability, and fuel efficiency. For dry van bodies, aluminum is preferred for its lightweight properties and corrosion resistance, while FRP (Fiberglass Reinforced Plywood) offers a smooth surface for branding and better impact resistance. For refrigerated bodies (reefers), high-density polyurethane foam insulation with a thermal-bridge-free design is critical to maintain temperature integrity. For heavy-duty tippers or construction bodies, high-tensile steel (e.g., Hardox) is essential to withstand abrasive loads and structural stress.