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The Chevrolet Silverado's tailgate cable capacity can change based on factors like where the load is positioned, the vehicle's weight, wheelbase, and the loading ramp length. Typically, the tailgate support cables are 3/16" thick with a safe working load of 840 lbs. For the 2006 2500 HD carrying a 300 lb load evenly distributed (150 lbs on each side), cable tension falls between 307 and 710 lbs. The higher number reflects a load placed right at the brink of the tailgate during loading. When the bed is loaded and one end is resting fully on the tailgate or at the edge, the total tension is 307-348 lbs. If the load is too heavy or incorrectly placed, the tailgate might buckle or the cables could break.
The maximum weight allowed on the tailgate is specified as 840 pounds for a secure working capacity.