The towing capacity of a 2004 Chevy Trailblazer varies depending on the engine and whether it's a 2WD or 4WD model. You won't find a single number. To know for sure, you need to
check the sticker located on the driver's side doorjamb. This sticker will list the specific towing capacity for your *exact* vehicle configuration.
Generally, expect the towing capacity to be in the range of 3,500 to 5,200 pounds, but again, this is just a general range. The doorjamb sticker is the only reliable source of this information.