I just got a Travel trailer for the fam and I am trying to figure out how to improve the towing performance on my suburban. I picked up the suburban last summer. It seemed to be in really good shape. It now has 157k miles, running really strong. It is a k1500 4x4. It has a cold air intake, corvette solenoids on the transmission (4l60e?), 5.7 liter, cat back dual exhaust, stock height. I got it from a guy who runs a tire shop and a detail business, so he really seemed to take care of it. I don't know what gearing it has, but I was thinking of changing it to 4:10. I heard that headers will most likely not help or even lower low end torque. So...what do you guys think. What could I do to improve towing performance? What is the stock gearing on it? What is the towing rating for it. I have a trailer that is probably around 4200#. Thanks.