2004 GMC Sierra 1500 Pickup Owner's Manual - Page 361

Here are some guidelines for safely carrying a snow plow on your vehicle: Q: What is front axle reserve capacity, and how do I calculate it? • Make sure the weight on the front and rear axles does not exceed the axle rating for each. A: • For the front axle, if more cargo or passengers must be carried, appropriate counter ballast must be installed rear of the rear axle. Counter ballast must be properly secured so it will not move during driving. Front axle reserve capacity is the difference between your front GAWR and the front axle weight of your truck with full fuel and passengers. Basically, it is the amount of weight you can add to your front axle before reaching your front GAWR. • Follow the snow plow manufacturer's recommendations regarding rear ballast. Rear ballast may be required to ensure a proper front and rear weight distribution ratio, even though the actual weight at the front axle may be less than the front axle rating. The front axle reserve capacity for your vehicle can be found in the lower right corner of the Certification/Tire label, as shown. • The snow plow manufacturer or installer can assist you in determining the amount of rear ballast required, to help make sure your snowplow/vehicle combination does not exceed the GVW rating, the front and rear axle ratings, and the front and rear weight distribution ratio. • The total vehicle must not exceed the GVW rating. United States Canada 4-65