Air brake hose demand is climbing as trailer orders jump 97% year over year. This guide walks fleet managers through a trailer-side brake hose program: spec connection hoses for flex life, stock the coil and straight assemblies that fit your trailer configurations, build a trailer inspection into your PM routine, and lock in SAE J1402 batch documentation with your supplier. A five-metric scorecard - fitment coverage, inspection frequency, chafe protection, documentation, stock buffer - helps you check your growing fleet against a clear target.