It still depends on the rear axle ratio. You need to have someone get you a picture of the RPO sticker in the glovebox and see whether it has GT4/GT5/GU5/GU6 listed for 3.73/4.10/3.23/3.42 gears respectively. The higher the ratio number the more it can feasibly tow but the lower your gas mileage. I think 5k lbs is the base and remember seeing the upper end around 7klbs.well it's now morphed into s 2010 1500 LTZ - so probably 5,500 lbs towing? Must be the 2500 (if that was offered in 2010) that hauls 8,100?