The best way to determine the towing capacity of a Chevrolet truck is to check the owner's manual. Towing capacity is also often called the gross vehicle weight rating, or GVWR.
The owner's manual should cover towing capacity as well as any special requirements or recommendations for your vehicle. The GVWR should also be listed on a certification plate on the side of the driver's side door. If in doubt, contact your local Chevrolet dealer for assistance.
You can also look up the towing capacity online. The manufacturer's website often lists towing capacities, as do reputable towing capacity charts. Year and model affect towing capacity; for example, a Chevrolet Silverado with a double cab can generally tow more than the same truck with a regular cab. Special towing packages or other optional features can also increase a vehicle's towing capacity.
Check the rating of your hitch, as some hitches are rated for less weight than the vehicles to which they are attached, which can lead to failure or other damage. It may be possible to replace the hitch.
Factor in the weight of the trailer as well as all cargo when calculating the truck's towing capacity, and include the weight of any passengers or equipment carried in the truck.