I just joined this RV Forum, and I have a question. About 3 months ago I purchased a Chevy Silverado 1500 Ext. Cab w/6.5' bed. The truck has the 5300 V8 and the towing pkg. (hooking up the brake controller was a breeze). I found a web site that list the towing capacity of this truck at 7,100 lbs. with a 3.42 gear ratio and at 8,100 lbs with a 3.73 gear ratio. But my truck list the gear ratio as 3.23. With these figures, I used a ratio formula to calculate approx. 6,600 towing capacity with my truck. Does this sound about right. The GVWR of the truck is 6,200 lbs. if that makes any difference. Also the truck has the trailer towing button on the shift lever to make the transmission accomodate towing a trailer. Thanks for any info.