Thanks everyone. There is a wealth of information here. I checked the weight tag on my truck and found the following information: GVWR 9900, FRONT GAWR 5200, REAR GAWR 6830. I don't know how to calculate total towing capacity from those numbers. I bought this truck new. When new it had 3.73 differential gearing. I had those gears changed to 4.56. That increased the towing capacity of the truck, but I don't remember how the truck shop calculated those numbers. Can anyone determine the maximum weight 5er this truck can tow?