Hi - I'm a new member and somewhat confused by all the numbers listed for towing capacities on my truck. I have a 2004 Silverado 2500HD with a 6.0L engine and 4.10 gears. I have a 1990 Sunlite 850WT ...
The weight of the trailer's tongue is carried by the truck, which means your truck needs to have enough payload capacity left for the trailer tongue.
Pay attention to your rear axle weight. If it's over 6084, you have ZERO towing capacity left, and you are exceeding the axle capacity with just the camper.
In other words, your towing capacity is (GCWR - actual weight of the truck), as long as there is available payload capacity for the tongue weight.