The three separate legal inspection duties people collapse into one, what actually fails and what puts a vehicle out of service, coupling and the fifth wheel, weight and balance and why axle limits bind independently of the gross, the two cargo securement rules that must both be satisfied, and the loads that behave badly.
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Inspection and securement are where the manual and the CFR overlap most, so the explanations give the regulation as well as the manual’s advice — the two carry very different weight at a roadside inspection.